Echinocereus ctenoides – Echinocereus monacanthus

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Echinocereus ctenoides* Lemaire 1868:57 nom. nud.
  [Probably = Echinocereus ctenoides Engelmann ex Rumpler].
Echinocereus ctenoides (Engelmann) Engelmann ex Rumpler 1886:819.
  basionym: Cereus ctenoides Engelmann 1856:279. [see Engelmann 1859:31].
    Type - locality: Coahuila, between Eagle Pass & Santa Rosa; Bigelow, Jan. 1853 (MO).
      Nomenclatural synonyms:
        Echinocereus dasyacanthus var. ctenoides (Engelmann) Backeberg1960:2021.
        Echinocereus pectinatus var. ctenoides* Weniger 1971:31 nom. inval. (no basionym given).
        Echinocereus pectinatus var. ctenoides (Engelmann) Weniger ex Frank 1991:135.
        Echinocereus pectinatus subsp. ctenoides (Engelmann) Frank 1997:136.
        Echinocereus spinosissimus var. ctenoides* (Engelmann) Ito 1981:237. nom. inval. (no basionym).
          Note: Echinocereus pectinatus var. wenigeri is considered by Frank (1997) to be a taxonomic synonym of this species.
Echinocereus cucumis Werdermann 1949:3-4.
  Type - locality: unknown [received from Hummel in 1937 without location noted, but probably from Sonora, Mexico].
    Nomenclatural synonyms:
      Echinocereus noctiflorus* Hort. ex Backeberg 1960:1991 pro syn.
      Echinocereus nocturniflorus* Hort. ex Backeberg 1960:1991 pro syn.
      Echinocereus scheeri var. gentryi cultivar 'Cucumis' (Werdermann) Taylor 1984:155.
      Echinocereus scheeri var. gentryi fa. cucumis* Parker 1996:4 nom. nud.
        Note: Usually considered a taxonomic synonym of Echinocereus scheeri subsp. gentryi.
Echinocereus dahliaflorus*.
  [An April fool prank name in Mollers Deutche Garter-Zeitung 15:148 (1900) ].
Echinocereus dasyacanthus Engelmann 1848a:100.
  Type - locality: Mexico, Chihuahua, Mtns. near Cd. Juarez; Wislizenus (MO).
    Nomenclatural synonyms:
      Cereus dasyacanthus (Engelmann) Engelmann 1849:50.
      Cereus deflexispinus* Monville ex Labouret 1853:321 pro syn.
      Echinocereus pectinatus var. dasyacanthus (Engelmann) Engelmann ex Haage 1892:118.
      Echinocereus pectinatus var. dasyacanthus* Earle 1971:80 nom. illegit. (later homonym).
      Echinocereus pectinatus var. dasyacanthus* Taylor 1984:179 nom. illegit. (later homonym).
        Note: Benson uses the name Echinocereus pectinatus var. neomexicanus for this species. Neotype: Wright (MO 2016859)
Echinocereus dasyacanthus subsp. crockettianus D. Felix & H. Bauer 2014. EcJ-Online 2 Sonderheft: V
  Type - locality: Texas: Crockett County, near Fort Lancaster; Anonymous 000577; 1991 (JE42/14)
Echinocereus dasyacanthus var. ctenoides (Engelmann) Backeberg 1960:2021.
  = Echinocereus ctenoides.
Echinocereus dasyacanthus ssp. ctenoides (Engelmann) Lode, Cact.-Avent. Int. 100:29, 2013.
  = Echinoereus ctenoides.
Echinocereus dasyacanthus var. hildmannii* Arendt ex Weniger 1970:33 nom. inval. (no basionym given)
  = Echinocereus hildmannii.
Cereus dasyacanthus var. minor* Engelmann 1856:278 nom. illegit.
  = Echinocereus roetteri.
    Note: This name is rejected by the author in his addenda of corrections and replaced by Echinocereus roetteri.
Echinocereus dasyacanthus subsp. multispinosus D. Felix & H. Bauer 2014. - EcJ-Online 2 Sonderheft: VII
  Type - locality: Mexico: Chihuahua; west of  Sierra El Morrion; Anonymous 002236; 1997 (JE 41/14)
Cereus dasyacanthus var. neomexicanus Coulter 1896:384.
  Type - locality: "stony prairies along Escondido Creek", [Pecos County, Texas]; Wright 366, 6 June 1851 (MO).
    Nomenclatural synonyms:
      Echinocereus pectinatus var. neomexicanus (Coulter) Benson 1944:256.
      Echinocereus dasyacanthus var. neomexicanus* Coulter ex Weniger 1970:32 nom. inval.
        Note: Benson uses the name Echinocereus pectinatus var. neomexicanus for Echinocereus dasyacanthus subsp.
          dasyacanthus. The original var. neomexicanus was probably a natural hybrid (see Zimmerman 1993).
Echinocereus dasyacanthus var. neomexicanus* Coulter ex Weniger 1970:32 nom. inval. (no basionym given).
Echinocereus dasyacanthus var. rectispinus Trocha & Fethke 1991:31-40.
  Type - locality: Mexico, Chihuahua, near Villa Ahumada; Fiehn 1979. (Hamburg Herbarium).
    Nomenclatural synonyms:
      Echinocereus pectinatus var. rectispinus* Zimmerman 1993:277 pro syn.
      Echinocereus dasyacanthus subsp. rectispinus (Trocha & Fethke) Blum, Rischer & Rutow in Blum .
Echinocereus dasyacanthus subsp. rectispinus (Trocha & Fethke) Blum, Rischer & Rutow in Blum et al. 1998a:2. [see Blum et al. 1998b:118].
  = Echinocereus dasyacanthus var. rectispinus Trocha & Fethke 1991.
Echinocereus dasyacanthus var. rigidissimus (Engelmann) Marshall & Bock 1941:119.
  = Echinocereus pectinatus var. rigidissimus.
Echinocereus dasyacanthus fa. roetteri* Parker 1996:2 nom. nud.
  = Echinocereus roetteri.
Echinocereus dasyacanthus var. rubrus* Frič 1924:121 nom. nud.
Cereus dasyacanthus var. spurius Labouret 1853:321.
  Type - locality: unknown; ? (?).
    Nomenclatural synonyms:
      Cereus deflexispinus var. spurius Monville ex Labouret 1853:321. pro syn.
Echinocereus dasyacanthus var. steereae (Clover) Marshall 1945:115.
  = Echinocereus steereae.
Echinocereus dasyacanthus fa. steereae* Parker 1996:2 nom. nud.
  = Echinocereus steereae.
Echinocereus datae Laferriere 1997:28.
  Type - locality:Mexico, Chihuahua, near Nabogame; Laferriere 1425, 8 Apr 1988 (ARIZ).
Echinocereus davisii Houghton 1931:466.
  Type - locality: Texas, 4 mi. south of Marathon; 4000 ft., Houghton 700 (US 1566585).
    Nomenclatural synonyms:
      Echinocereus viridiflorus var. davisii (Houghton) Marshall & Bock 1941:119.
      Echinocereus viridiflorus fa. davisii (Houghton) Krainz 1967:51.
      Echinocereus viridiflorus subsp. davisii (Houghton) Taylor 1997:10.
Echinocereus decumbens Clover & Jotter 1941:417.
  Type - locality: Arizona, Coconino Co., Mile 16. ; Marble Canyon; Clover & Jotter 2212, 15 July 1938 (MICH 1115972).
    Nomenclatural synonyms:
      Echinocereus engelmannii var. decumbens (Clover & Jotter) Benson 1944:258.
      Echinocereus engelmannii subsp. decumbens (Clover & Jotter) Blum & Lange in Blum et al. 1998a:2.
Cereus deflexispinus* Monville ex Labouret 1853:321 pro syn.
  = Echinocereus dasyacanthus.
Cereus deflexispinus* var. spurius Monville ex Labouret 1853:321 pro syn.
  = Cereus dasyacanthus var. spurius.
Echinocereus degandii* Rebut ex Schumann 1895:123 nom. nud.
  [Probably = Echinocereus dasyacanthus].
Echinocereus delaetii (Gurke) Gurke 1909b:131.
  basionym: Cephalocereus delaetii Gurke 1909a:116-121.
    Type - locality: unknown [Probably Sierra Paila, Coahuila].
      Nomenclatural synonyms:
        Echinocereus longisetus var. delaetii (Gurke) Taylor 1988:79.
        Echinocereus longisetus subsp. delaetii (Gurke) Taylor 1997:9.
Echinocereus delaetii var. freudenbergeri (Frank) Taylor 1985b:97.
  = Echinocereus freudenbergeri.  [see Echinocereus longisetus subsp. freudenbergii ].
Cereus deppei Salm-Dyck 1834:338.
  Type - locality: Mexico; ? (?).
    Note: This species is usually considered a taxonomic synonym of Echinocereus cinerascens.
Cereus deppei* Hort. Berol. ex Pfeiffer 1837:101 pro syn.
  = Echinocereus cinerascens.
Cereus deppei* Hort. Paris ex Salm-Dyck 1845:27 nom. nud.
Echinocereus deppei *(Salm-Dyck) Schumann 1895:123 pro syn.
  = Echinocereus cinerascens.
Echinocereus depressus* Haage 1900:157 nom. nud.
*Echinocereus diguetii* Hort. nom. nud. = Peniocereus diguetii.
Echinocereus dubius (Engelmann) Engelmann ex Rumpler 1886:787.
  basionym: Cereus dubius Engelmann 1856:282-283. [see in Engelmann 1859:36].
    Type - locality: Texas, Hudspeth Co. near Rio Grande; Wright 410, 19 June 1852 (MO 3347359).
      Nomenclatural synonyms:
        Echinocereus malibrani* Rebut ex Haage 1892:118.
        Echinocereus enneacanthus var. dubius (Engelmann) Benson 1969d:127.
        Echinocereus enneacanthus fa. dubius* Parker 1996:2 nom. nud.
          Note: This species is usually considered to be a taxonomic synonym of Echinocereus enneacanthus subsp. enneacanthus.
*Echinocereus dumenilianus Monville ex Haage 1859:19 = Echinopsis sp.
Echinocereus dumesnilianus* Walton 1898:26  pro syn. = Echinocereus candicans var. dumesnilianus*
Echinocereus durangensis Poselger ex Rumpler 1886:799.
  Type - locality: Mexico, Durango; ? (?).
    Nomenclatural synonyms:
      Echinocereus acifer var. durangensis (Poselger ex Rumpler) Schumann 1897:287.
      Echinocereus polyacanthus var. durangensis * Parker 1996:4 nom. nud.
        Note: Taylor (1985b) lists this name as a synonym of Echinocereus polyacanthus.
Echinocereus durangensis var. nigrispinus Hort. ex Rumpler 1886:800.
  Type - locality: Mexico, Durango; ? (?).
Echinocereus durangensis var. rufispinus Hort. ex Rumpler 1886:800.
  Type - locality: Mexico, Durango; ? (?).
Echinocereus ehrenbergii* Engelmann ex Haage 1859:19. nom. nud.
  [Probably = Echinocereus ehrenbergii (Pfeiffer) Pfeiffer ex Rumpler].
Echinocereus ehrenbergii (Pfeiffer) Pfeiffer ex Rumpler 1886:775.
  basionym: Cereus ehrenbergii Pfeiffer 1840:282.
    Type - locality: Mexico, Hidalgo, Mineral del Monte [according to Schumann 1897:262]; Ehrenberg (?).
      Nomenclatural synonyms:
        Echinocereus pentalophus var. ehrenbergii (Pfeiffer) Backeberg 1960:2003.
        Echinocereus cinerascens var. ehrenbergii (Pfeiffer) Bravo 1974:47.
        Echinocereus cinerascens subsp. ehrenbergii (Pfeiffer) Blum & Rutow in Blum et al. 1998a:4.
*Echinocereus emoryi = Bergerocactus emoryi.
Echinocereus engelmannii* Lemaire 1868:56 nom. nud.
  [Probably = Echinocereus engelmannii Parry ex Rumpler].
Echinocereus engelmannii* Harry ex Seitz 1878:10. nom. nud.
  [Probably = Echinocereus engelmannii Parry ex Rumpler].
Echinocereus engelmannii (Parry ex Engelmann) Parry ex Rumpler 1886:805.
  basionym: Cereus engelmannii Parry ex Engelmann 1852:328.
    Type - locality: California, Mountains near San Felipe; Parry (?). [Neotype: California, San Felipe Valley; Benson 16386 (POM).
Echinocereus engelmannii var. acicularis Benson 1969a:22.
  Type - locality: Arizona Maricopa Co., Crossing of New River, south side of Black Canyon Refuge, 1300 ft.; Benson 16,616,
    20 Apr. 1966 (POM 311313).
Echinocereus engelmannii var. albispinus Carp 1894:29.
  Type - locality: unknown; ? (?).
Echinocereus engelmannii var. albispinus Cels ex Schumann 1897:276 nom. nud.
Echinocereus engelmannii var. armatus Benson 1969c:33.
  Type - locality: Calif., San Bernardino Co., Dead Man Point; Benson 14767, 1 Apr. 1951 (POM 284927).
Echinocereus engelmannii var. bonkerae* Mesa Garden Seed Catalog 1996 nom. nud.
  = Echinocereus bonkerae.
Echinocereus engelmannii var. boyce-thompsonii* Mesa Garden Seed Catalog 1996 nom. nud.
  = Echinocereus boyce-thompsonii.
Echinocereus engelmannii var. caespitosus* Orcutt 1897:276 nom. nud.
Echinocereus engelmannii var. chrysocentrus (Engelmann & Bigelow) Engelmann ex Rumpler 1886:806.
  basionym: Cereus engelmannii var. chrysocentrus Engelmann & Bigelow in Engelmann 1856:283. [see Englemann 1857:35].
    Type - locality: Arizona, Bill Williams River; J. M. Bigelow, 13 Feb. 1854 (MO).
      Nomenclatural synonyms:
        Echinocereus chrysocentrus (Engelmann & Bigelow) Orcutt 1926:4.
        Echinocereus engelmannii fa. chrysocentrus (Engelmann & Bigelow) Schelle 1907:135
Echinocereus engelmannii fa. chrysocentrus (Engelmann & Bigelow) Schelle 1907:135.
  = Echinocereus engelmannii var. chrysocentrus.
Echinocereus engelmannii var. decumbens (Clover & Jotter) Benson 1944:258.
  = Echinocereus decumbens.
Echinocereus engelmannii subsp. decumbens (Clover & Jotter) Blum & Lange in Blum et al. 1998a:2. [see Blum et al. 1998b:76].
  = Echinocereus decumbens.
Echinocereus engelmannii var. fasciculatus* Mesa Garden Seed Catalog 1996 nom. nud.
  = Echinocereus fasciculatus.
Echinocereus engelmannii subsp. fasciculatus (Engelmann ex Watson) Blum & Lange in Blum et al. 1998a:2.
  = Echinocereus fasciculatus.
    Note: see Blum et al. 1998b:78.
Echinocereus engelmannii var. fulvispinus* Cels ex Schumann 1897:276 nom. nud.
Echinocereus engelmannii var. howei Benson 1974:80.
  Type - locality: Calif., San Bernardino Co., east of Goffs; D. F. Howe 4570 (POM 317,886).
Echinocereus engelmannii subsp. llanuraensis (Rutow) Felger 1999: 20. Proc. San Diego Soc. Nat. Hist., 35: 20.
  =Echinocereus nicholii subsp. llanuraensis Rutow.
Echinocereus engelmannii var. munzii (Parish) Pierce & Fosberg 1933:123.
  = Echinocereus munzii.
Echinocereus engelmannii subsp. munzii* Blum 1997 Seed List nom. nud.
  = Echinocereus munzii.
Echinocereus engelmannii fa. munzii* (Parish) Ruinaard, Succulenta 89(3): , Nom. inval. (Art. 33.4),
  = Echinocereus munzii.
Echinocereus engelmannii var. nicholii Benson 1944:258.
  Type - locality: Arizona, Pima Co., Silver Bell Mtns.; Benson 10720, 28 Mar. 1941 (Ariz 34989).
    Nomenclatural synonyms:
      Echinocereus nicholii (Benson) Parfitt 1987:157-158.
      Echinocereus engelmannii subsp. nicholii* (Benson) Breckwoldt 1993:8 nom. inval.
Echinocereus engelmannii subsp. nicholii* (Benson) Breckwoldt 1993:8 nom. inval. (no basionym given)
  = Echinocereus engelmannii var. nicholii
Echinocereus engelmannii var. pfersdorffii* Heyder ex Schumann 1897:276 nom. nud.
Echinocereus engelmannii var. purpureus Benson 1969d:126-127.
  Type - locality: Utah, Washington Co., north of St. George, 2900 ft.; Benson 13637, 5 May 1949 (POM 285578).
Echinocereus engelmannii var. robustior* Haage 1892:117 nom. nud.
Echinocereus engelmannii var. robustior* Hildmann ex Hirscht 1894:194 nom. nud.
Echinocereus engelmannii var. variegatus (Engelmann & Bigelow) Engelmann ex Rumpler 1886:806.
  basionym: Cereus engelmannii var. variegatus Engelmann & Bigelow in Engelmann 1856:283. [see Engelmann 1857:35].
    Type - locality: Arizona, Cactus Mountains at head of Bill Williams River; J.M. Bigelow, 1 Feb. 1854 (MO 2016811).
      Nomenclatural synonyms:
        Echinocereus engelmannii subsp. variegatus (Engelmann & Bigelow) E. Lutz 2000:97.
Echinocereus engelmannii fa. variegatus (Engelmann & Bigelow) Schelle 1907:135.
  = Echinocereus engelmannii var. variegatus.
Echinocereus engelmannii subsp. variegatus* Breckwoldt 1993 in Kakteen und andere Sukkulenten 44(8) nom. inval.(No basionym)
  = Echinocereus engelmannii var. variegatus.
Echinocereus engelmannii subsp. variegatus ( Engelm. & J.M.Bigelow ) E. Lutz. 2000:97.
  = Echinocereus engelmannii var. variegatus.
Echinocereus engelmannii var. versicolor* Hirscht 1894:194 nom. nud.
Echinocereus engelmannii var. versicolor Walton 1898:118,
  Type - locality: California (?).
Echinocereus enneacanthus Engelmann 1848a:111.
  Type - locality: Mexico, Chihuahua, near San Pablo; Wislizenus 244, 8 Apr. 1847 (MO 83797).
    Nomenclatural synonyms:
      Cereus enneacanthus (Engelmann) Engelmann 1849:50.
        Note: Echinocereus lowryi* Lowry 1936:20 nom. nud. and Echinocereus albiflorus* Lowry 1937:20 nom. nud. are probably
          forms of this species.
Echinocereus enneacanthus fa. brevispinus Moore 1967:93-94.
  Type - locality: Texas, Starr Co., 8 miles East of Rio Grande City; Clover, 31 Dec 1953 (MICH).
    Nomenclatural synonyms:
      Echinocereus enneacanthus var. brevispinus (Moore) Benson 1969d:127.
      Echinocereus enneacanthus subsp. brevispinus (Moore) Taylor 1997:8.
Echinocereus enneacanthus var. brevispinus (Moore) Benson 1969d:127.
  = Echinocereus. enneacanthus fa. brevispinus.
Echinocereus enneacanthus subsp. brevispinus (Moore) Taylor 1997:8.
  = Echinocereus enneacanthus fa. brevispinus.
Echinocereus enneacanthus var. brevispinus fa. carnosus* Parker 1996:2 nom. nud.
  = Echinocereus carnosus.
Echinocereus enneacanthus fa. carnosus (Rumpler) Schelle 1907:127.
  = Echinocereus carnosus.
Echinocereus enneacanthus var. carnosus* Quehl 1908:114 nom. nud.
  [Probably = Echinocereus carnosus].
Echinocereus enneacanthus fa. carnosus* is attributed incorrectly to Matthson ex Schumann by Bravo 1991:76.
Echinocereus enneacanthus var. conglomeratus (Blanc) Benson 1974:80.
  = Echinocereus conglomeratus.
Echinocereus enneacanthus var. dubius (Engelmann) Benson 1969d:127.
  = Echinocereus dubius.
Echinocereus enneacanthus fa. dubius* Parker 1996:2 nom. nud.
  = Echinocereus dubius.
Echinocereus enneacanthus var. erectus* Haage 1892:117 nom. nud.
Echinocereus enneacanthus fa. intermedius Moore 1967:93.
  Type - locality: Texas, Starr Co., off La Grulla Road, Clover, 23 Mar. 1953 (MICH 1133318).
    Note: Usually considered a taxonomic synonym of Echinocereus enneacanthus subsp. brevispinus.
Echinocereus enneacanthus fa. major* Schelle 1907:127 nom. nud.
Echinocereus enneacanthus fa. major* Hort. ex Borg 1951:223 nom. inval.
Echinocereus enneacanthus var. majus* Haage 1892:117 nom. nud.
Echinocereus enneacanthus fa. merkeri* Parker 1996:2 nom. nud.
  = Echinocereus merkeri.
Echinocereus enneacanthus fa. sarissophorus* Parker 1996:2 nom. nud.
  = Echinocereus sarissophorus.
Echinocereus enneacanthus var. stramineus (Engelmann) Benson 1969d:127.
  = Echinocereus stramineus.
Echinocereus enneacanthus fa. uspenskii* Parker 1996:2 nom. nud.
  = Echinocereus uspenskii.
*Echinocereus erectocentrus var. pallidus error in spelling = Echinomastus erectocentrus.
Echinocereus fasciculatus (Engelmann) Benson 1969a:21.
  basionym: Mammillaria fasciculata* Engelmann in Emory 1848:156. nom. prov.
    Type - locality: Arizona, Graham Co. 6-7 miles east of Solomon. [Neotype - Benson 16633, 22 April 1966 (POM 311339) ].
      Nomenclatural synonyms:
        Echinocereus fendleri var. fasciculatus (Engelmann) Taylor 1985a:252.
        Echinocereus engelmannii var. fasciculatus* Mesa Garden Seed Catalog 1996 nom. nud.
        Echinocereus engelmannii subsp. fasciculatus (Engelmann ex Watson) Blum & Lange in Blum et al. 1998a:2.
          Note: The validity of the name Echinocereus fasciculatus is uncertain. Echinocereus robustus is usually considered to be a
            taxomnomic synonym of this plant. The  name Mammillaria fasciculata is listed as a synonym of Cereus fendleri by
              Watson 1878:404.
Echinocereus fasciculatus subsp. abbeae* Blum 1997 Seed List nom. nud.
  = Echinocereus abbeae.
Echinocereus fasciculatus var. bonkerae (Thornber & Bonker) Benson 1969a:22.
  = Echinocereus bonkerae.
Echinocereus fasciculatus subsp. bonkerae (Thornber & Bonker) Taylor 1997:8.
  = Echinocereus bonkerae.
Echinocereus fasciculatus var. boyce-thompsonii (Orcutt) Benson 1969a:21.
  = Echinocereus boyce-thompsonii.
Echinocereus fasciculatus subsp. boyce-thompsonii (Orcutt) Taylor 1997:8.
  = Echinocereus boyce-thompsonii.
Echinocereus fasciculatus var. rectispinus* Benson 1969a:131 pro syn.
  = Echinocereus rectispinus.
Echinocereus fasciculatus fa. robustus* Parker 1996:2 nom. nud.
  = Echinocereus robustus.
Echinocereus felixianus H. Bauer 2014. - EcJ-Online 2 Sonderheft: IX
  Type - locality: Mexico: Coahuila: Municipio Cuatro Cienegas de Carranza; Anonymous 005387; 2010 (JE 42/14).
Echinocereus fendleri* Sencke ex Seitz 1870:11 nom. nud.
  [Probably a synonym of Echinocereus fendleri Loder].
Echinocereus fendleri (Engelmann) Loder 1882:445.
  basionym: Cereus fendleri Engelmann 1849:51.
    Type - locality: New Mexico, near Santa Fe; Fendler 273, June 1846 (MO 2016839).
      Nomenclatural synonyms:
        Echinocereus melaleuca* Foster ex Haage 1892:117 nom. nud.
        Cereus cinerascens var. fendleri (Engelmann) Bois 1928:371.
          Note: Usually listed as Echinocereus fendleri Engelmann ex Rumpler 1886:801 or Senke ex Haage. 1893:22.
Echinocereus fendleri var. albiflorus (Weingart) Backeberg 1960:2047.
  = Echinocereus albiflorus.
Echinocereus fendleri fa. albiflorus* Parker 1996:2 nom. nud.
  = Echinocereus albiflorus Weingart.
Echinocereus fendleri var. bonkerae (Thornber & Bonker) Benson 1944:260
  = Echinocereus bonkerae.
Echinocereus fendleri var. boyce-thompsonii (Orcutt) Benson 1944:260.
  = Echinocereus boyce-thompsonii.
Echinocereus fendleri var. fasciculatus (Engelmann) Taylor 1985a:252.
  = Echinocereus fasciculatus.
Echinocereus fendleri var. hempelii* Mesa Garden Seed Catalog 1996 nom. nud.
  = Echinocereus hempelii.
Echinocereus fendleri subsp. hempelii Blum in Blum et al. 1998a:2. [see Blum et al. 1998b:93].
  = Echinocereus hempelii.
Echinocereus fendleri var. kuenzleri (Castetter et al.) Benson 1982:942.
  = Echinocereus kuenzleri.
Echinocereus fendleri subsp. kuenzleri* Blum 1997 Seed List nom. nud.
  = Echinocereus kuenzleri.
Echinocereus fendleri subsp. kuenzleri (Castetter et al.) W. Blum & D. Felix. 2014 - EcJ-Online 2 (2): 105.
  = Echinocereus kuenzleri.
Echinocereus fendleri var. ledingii (Peebles) Taylor 1985a:253.
  = Echinocereus ledingii.
Echinocereus fendleri var. major* Haage 1900:158 nom. nud.
Echinocereus fendleri var. major Rother 1930:109.
  Type - locality: Mexico (?)
Echinocereus fendleri var. pauperculus (Engelmann) Schumann 1897:275.
  basionym: Cereus fendleri var. pauperculus Engelmann 1849:51.
    Type - locality: New Mexico, near Santa Fe; Fendler, 4 Nov. 1846 (MO).
Echinocereus fendleri var. rectispinus (Peebles) Benson 1944:259.
  = Echinocereus rectispinus.
Echinocereus fendleri subsp. rectispinus (Peebles) Taylor 1997:9.
  = Echinocereus rectispinus.
Echinocereus fendleri var. robustus Fobe 1911:55 [not Benson 1944].
  Type - locality: unknown; ? (?).
Echinocereus fendleri var. robustus* (Peebles) Benson 1944:259 nom. illegit. (later homonym).
  = Echinocereus robustus.
Echinocereus fereirae*  Gates 1935:154 nom. prov. for Echinocereus ferreirianus Gates 1953. [ = Gates 550]
Echinocereus ferreirianus Gates 1953:8-11.
  Type - locality: Mexico, Baja Calif. Norte, Isla Piojo, Bahia de los Angeles; H. E. Gates, 1934 (DS 375348).
Echinocereus ferreirianus var. lindsayi (Meyran) Taylor 1985b:46.
  = Echinocereus lindsayi.
Echinocereus ferreirianus subsp. lindsayi (Meyran) Taylor 1997:9.
  = Echinocereus lindsayi.
Echinocereus ferreirrae* Gates 1935:154 nom. nud. [= Gates number 550].
  = Echinocereus ferreirianus.
Echinocereus fiehnii* Lau 1992:74 nom. nud.
  = Echinocereus russanthus var. fiehnii.
Echinocereus finnii* Hort. ex Taylor 1985 101 pro syn.
  = Echinocereus russanthus var. fiehnii.
Echinocereus fitchii Britton & Rose 1922:30.
  Type - locality: Texas, near Laredo; Rose 18037, 1913 (US 1821071).
    Nomenclatural synonyms:
      Echinocereus reichenbachii var. fitchii (Britton & Rose) Benson 1969d:127.
      Echinocereus reichenbachii subsp. fitchii (Britton & Rose) Taylor 1997:9.
Echinocereus fitchii var. albertii* Mesa Garden Seed Catalog 1996 nom. nud.
  = Echinocereus reichenbachii var. albertii.
Echinocereus fitchii subsp. albertii (Benson) Blum & Lange in Blum et al. 1998a:5. [see Blum et al. 1998b:313].
  = Echinocereus reichenbachii var. albertii.
Echinocereus fitchii var. armatus* Mesa Garden Seed Catalog 1996 nom. nud.
  = Echinocereus pectinatus var. armatus.
Echinocereus fitchii subsp. armatus (Poselger) Blum, Lange & Rutow in Blum et al. 1998a:5. [see Blum et al. 1998b:314].
  = Echinocereus pectinatus var. armatus.
Echinocereus fitchii subsp. bergmannii Blum 2005:265.
  Type - locality: Mexico, Tamaulipas, Sierra de San Carlos; Bergmann 221, 5 Sept. 2003 (UAT 021650).
*Echinocereus flavescens = Haageocereus sp.
Echinocereus flavidiflorus* Haage 1892:117 nom. nud.
Echinocereus flavidiflorus* Hildmann ex Schumann 1897:264 pro syn.
  = Echinocereus leonensis.
Echinocereus flaviflorus (Coulter) Coulter ex Schumann 1897:274.
  basionym: Cereus flavidiflorus Engelmann ex Coulter 1896:391.
    Type - locality: Mexico, Baja California del Norte, west of San Borgia; Gabb 10, 1867 (MO).
      Note: Usually considered a synonym of Echinocereus maritimus.
Echinocereus flavispinus* Bailey 1941:270 nom. nud.
Echinocereus floresii Backeberg 1949:5.
  Type - locality: Mexico, Sinaloa, near Topolobampo; R. Flores & F. Schwarz (?).
    Nomenclatural synonyms:
      Echinocereus sciurus var. floresii (Backeberg) Taylor1985b:115.
      Echinocereus sciurus subsp. floresii (Backeberg) Taylor1997:10.
      Echinocereus bristolii subsp. floresii Blum & Lange in Blum et al. 1998a:3. [see Blum et al. 1998b:353].
Echinocereus fobeanus Oehme 1940:49-50.
  Type - locality: unknown [Probably Coahuila]; ? (?).
    Nomenclatural synonyms:
      Echinocereus chisoensis var. fobeanus (Oehme) Taylor 1985a:261.
      Echinocereus chisoensis subsp. fobeanus (Oehme) N.P. Taylor 2005 Cactaceae Syst. Init. 19: 10.
        Note: Taylor (1993) lists Echinocereus metornii as a taxonomic synonym of this species.
Echinocereus fobeanus subsp. metornii (Frank) Blum & Lange in Blum et al. 1998a:5. [see Blum et al. 1998b:307.]
  = Echinocereus metornii.
Echinocereus fordtii* spelling error for Echinocactus fordtii.
Echinocereus forsteri* Haage 1859:19. nom. nud.
Echinocereus freudenbergeri Frank 1981:102-105.
  Type - locality: Mexico, Coahuila, 12 km south of Cuatro Cienegas; G. Freudenberger (ZSS AA18-27).
    Nomenclatural synonyms:
      Echinocereus delaetii var. freudenbergeri (Frank) Taylor 1985b:97.
      Echinocereus setosus* Hort. ex Taylor 1988:76 pro syn.
      Echinocereus nivosus var. freudenbergeri* Parker 1996:3 nom. nud.
      Echinocereus longisetus subsp. freudenbergeri (Frank) Blum in Blum et al. 1998a:6. [see Blum et al. 1998b:187 ].
        Note: Taylor (1993) lists this species as a taxonomic synonym of Echinocereus nivosus.
Echinocereus galtieri* Hort. Grus. ex Schumann 1895:124 nom. nud.
Echinocereus galtieri Rebut ex Fobe 1911:56.
  Type - locality: unknown; ? (?).
    Nomenclatural synonyms:
      Echinocereus polyacanthus var. galtieri (Rebut ex Fobe) Schelle 1926:179.
Echinocereus gentryi Clover 1938:565.
  Type - locality: Mexico, Sonora, Canon Saucito; H.S. Gentry, 1932 (MICH).
    Nomenclatural synonyms:
      Echinocereus scheeri var. gentryi (Clover) Taylor 1984:154.
      Echinocereus scheeri subsp. gentryi (Clover) Taylor 1997:9
        Note: Echinocereus cucumis is usually considered a taxonomic synonym of this species.
*Echinocereus gladiatus = Echinopsis gladiata.
Echinocereus glycerius* Forster ex Haage 1859:19 nom. nud.
Echinocereus glycimorphus* Forster ex Seitz 1870:11 nom. nud.
Echinocereus glycimorphus Forster ex Rumpler 1886:800.
  Type - locality: unknown [Hidalgo near Ixmiquilpan and El Cardonal according to Schumann 1897:262] ; ? (?).
    Nomenclatural synonyms:
      Cereus glycimorphus (Forster ex Rumpler) Orcutt 1903:5.
      Echinocereus cinerascens fa. glycimorphus* Parker 1996:2 nom. nud.
Echinocereus glycimorphus var. undulatus Schelle 1926:166.
  Type - locality: unknown; ? (?).
    Note: Schelle 1926:166 lists Echinocereus undulatus* Hildmann as a synonym of this variety.
      Cereus glomeratus* Orcutt 1897:21 pro syn.= Echinocereus maritimus.
Echinocereus gonacanthus* Lemaire 1868:57 nom. nud.
  [Probably = Echinocereus gonacanthus Loder].
Echinocereus gonacanthus (Engelmann & Bigelow) Loder 1882:444.
  basionym: Cereus gonacanthus Engelmann & Bigelow in Engelmann 1856:283. [see Engelmann 1857:33].
    Type - locality: Arizona, Apache Co., Jacobs Well, 40 mi. west of Zuni; J. M. Bigelow, 29 Nov. 1853 (MO).
      Nomenclatural synonyms:
        Echinocereus paucispinus var. gonacanthus (Engelmann & Bigelow) Schumann 1897:281.
        Echinocereus triglochidiatus var. gonacanthus (Engelmann & Bigelow) Boissevain 1940:36.
          Note: Usually listed as Echinocereus gonacanthus Engelmann ex Rumpler 1886:806.
*Echinocereus grahamii (Monatschrift Kakteenkunde 20:47) error for Mammillaria grahamii.
Echinocereus grandis Britton & Rose 1922:18.
  Type - locality: Mexico, Gulf of California, San Esteban Island; J.N. Rose 16823, 13 Apr. 1911 (US).
    Nomenclatural synonyms:
      Echinocereus pectinatus var. grandis (Britton & Rose) Marshall 1955:68.
Echinocereus hancockii Dawson 1949:89-93.
  Type - locality: Mexico, Baja California Sur, north side of San Hipolito Bay; E. Y. Dawson 6443, 4 April 1949 (LAM).
    Nomenclatural synonyms:
      Echinocereus maritimus var. hancockii (Dawson) Taylor 1985b:44.
      Echinocereus maritimus subsp. hancockii (Dawson) Blum & Rutow in Blum et al. 1998a:6 [see Blum et al. 1998b:57 ].
Echinocereus havermansii* Rebut ex Haage 1892:118 nom. nud.
Echinocereus havernicki* Hildm. ex Schwarzbach & Bitter 1915:8 nom. nud.
Echinocereus hempelii Fobe 1897:187.
  Type - locality: Mexico [Probably Sierra del Nido, Chihuahua, Mexico] ; ? (?).
    Nomenclatural synonyms:
      Echinocereus fendleri var. hempelii * Mesa Garden Seed Catalog 1996 nom. nud.
      Echinocereus fendleri subsp. hempelii Blum in Blum et al. 1998a:2.
        Note: Some authors treat Echinocereus kuenzleri as a taxonomic synonym of this species.
Echinocereus hempelii var. centrispinus* Hort. nom. nud.
  [=HK 1489 from San Buenaventura, Chihuahua, Mexico].
Echinocereus hexaedrus (Engelmann & Bigelow) Engelmann ex Rumpler 1886:807.
  basionym: Cereus hexaedrus Engelmann & Bigelow in Engelmann 1856:285. [see Engelmann 1857:34].
    Type - locality: Arizona, Apache County, 15 miles west of Zuni; J. M. Bigelow, 28 Nov. 1853 (MO).
      Nomenclatural synonyms:
        Echinocereus paucispinus var. hexaedrus (Engelmann & Bigelow) Schumann 1897:281.
        Echinocereus triglochidiatus var. hexaedrus (Engelmann & Bigelow) Boissevain 1940:36.
        Echinocereus coccineus fa. hexaedrus* Parker 1996:4 nom. nud.
          Note: Considered by Taylor (1985b) as a taxonomic synonym of Echinocereus triglochidiatus var. melanacanthus.
Echinocereus hidalgensis* Hort. Berol. ex Backeberg 1962:3855-3856 nom. nud.
Echinocereus hildmannii Arendt 1892:146.
  Type - locality: unknown [West Texas according to Schelle 1926:175] ; ? (?).
    Nomenclatural synonyms:
      Echinocereus dasyacanthus var. hildmannii* Arendt ex Weniger 1970:33 nom. inval.
        Note: This plant may be a natural hybrid (see Zimmermann 1993).
Echinocereus huitcholensis (Weber) Gurke 1906:23.
  basionym: Cereus huitcholensis Weber 1904:383.
    Type - locality: Mexico, Jalisco, Sierra de los Huitcholes, 1800 m; L. Diguet, May 1900 (P).
      Nomenclatural synonyms:
        Echinocereus polyacanthus var. huitcholensis (Weber) Taylor1988:82.
        Echinocereus acifer subsp. huitcholensis (Weber) Lange 1994:109.
        Echinocereus polyacanthus var. acifer fa. huitcholensis*Parker 1996:4 nom. nud.
        Echinocereus polyacanthus subsp. huitcholensis (Weber) Taylor 1997:9.
*Echinocereus hypogaeus = Eridisia spiniflora.
Echinocereus inermis* Haage ex Hirscht 1898:130 pro syn.
  = Echinocereus knippelianus.
*Echinocereus intricatus = Echinopsis strigosa.
Echinocereus jacobyi* Hort. ex Schumann 1897:278 pro syn.
  = Echinocereus merkeri.
Echinocereus joconosle* Haage 1892:117 nom. nud.
Echinocereus klapperi Blum in Blum et al. 1998a:5. [see Blum et al. 1998b:380-383].
  Type - locality:Mexico, Sonora, El Novillo,500 m., Klapper 0121, 12 March 1983 (ZSS A 17985).
    Nomenclatural synonyms:
      Echinocereus klapperi subsp. bacanorensis (Rischer & Trocha) Rischer 2003:22.
Echinocereus klapperi subsp. bacanorensis (Rischer & Trocha) Rischer 2003:22.
  = Echinocereus salm-dyckianus subsp. bacanorensis Rischer & Trocha.
Echinocereus knippelianus Liebner 1895:170.
  Type - locality: unknown [Relocated in Sierra Parras, Coahuila, Mexico] ; ? (?).
    Nomenclatural synonyms:
      Echinocereus liebnerianus* Liebner ex Schumann 1896b:262 nom. nud.
      Echinocereus inermis* Haage ex Hirscht 1898:130 pro syn.
      Cereus knippelianus (Liebner) Orcutt 1902:27.
Echinocereus knippelianus subsp. kaplanii Halda & Stadkovshy 2000:34.
  Type - locality: Mexico, Nuevo Leon, North West of Los Mimbres alt. 2510 m.; Halda & Stadkovshy 8504132 (PR).
Echinocereus knippelianus var. kruegeri Glass & Foster 1978b:80.
  Type - locality: Mexico, Nuevo Leon, north of Ascencion near San Juanito; Glass & Foster 3902, 1 Mar. 1972 (POM).
Echinocereus knippelianus subsp. kruegeri (Glass & Foster) Blum & Lange in Blum et al. 1998b:248.
  = Echinocereus knippelianus var. kruegeri.
Echinocereus knippelianus var. kruegeri fa. reyesii* Parker 1996:3 nom. nud.
  = Echinocereus knippelianus var. reyesii.
Echinocereus knippelianus var. reyesii Lau 1980:264-265.
  Type - locality: Mexico, Nuevo Leon, between Siberia & Encantada; Lau 1237A, Apr. 1977 (POM).
    Nomenclatural synonyms:
      Echinocereus knippelianus var. kruegeri fa. reyesii*Parker 1996:3 nom. nud.
Echinocereus knippelianus subsp. reyesii (Lau) Blum & Lange in Blum et al.1998:250.
  = Echinocereus knippelianus var. reyesii.
Echinocereus knippelianus var. robustispinus* Hort. nom. nud.
  = Echinocereus knippelianus var. reyesii.
Echinocereus knippelianus var. schaetzleii* Nitzschke 1990:43 nom. prov.
Echinocereus knippelianus var. siberi giberia* Heyer 1989:26 nom. nud.
Echinocereus koehresianus* Hort. ex Taylor 1988:80 pro syn.
  = Echinocereus scheeri var. koehresianus.
Echinocereus koehresii* Hort. ex Taylor 1988:80 pro syn.
  = Echinocereus scheeri var. koehresianus.
Echinocereus koehresii (Frank) Rischer 2009:73
  = Echinocereus scheeri var. koehresianus.
Echinocereus koehresianus subsp. gruberianus W. Rischer 2014. - EcJ-Online 2 (1): 9.
  Type - locality: Mexico, Durango, Municipio Tayoltita; Chalet 5245, 7 May 2010 (IBUG).
Echinocereus krausei De Smet ex Rumpler 1886:789.
  Type - locality: unknown; ? (?).
    Note: This plant is usually listed as a taxonomic synonym of Echinocereus coccineus.
Echinocereus kroenleinii* Hort. nom. nud. = Wilcoxia kroenleinii.
Wilcoxia kroenleinii Cartier 1980:2-3.
  Type - locality: unknown, Kuenzler 379 (P) [Probably from Coahuila, Mexico] .
    Nomenclatural synonyms:
      Echinocereus poselgeri subsp. kroenleinii (Cartier) Lange 1995:138.
      Echinocereus poselgeri fa. kroenleinii* Parker 1996:6 nom. nud.
Echinocereus kuenzleri Castetter et al. 1976:77-78.
  Type - locality: New Mexico, Otero Co., Sacramento Mtns., Elk; Kuenzler 3585, 5 May 1968 (UNM 55571).
    Nomenclatural synonyms:
      Echinocereus pseudohempelii* Kunzler Cat. nom. nud.
      Echinocereus fendleri var. kuenzleri (Castetter et al.) Benson 1982:942.
      Echinocereus fendleri var. hempelii fa. kuenzleri* Parker 1996:2 nom. nud.
      Echinocereus fendleri subsp. kuenzleri* Blum 1997 Seed List nom. nud.
      Echinocereus fendleri subsp. kuenzleri (Castetter et al.) W. Blum & D. Felix. 2014 - EcJ-Online 2 (2): 105.
Echinocereus kuenzlerioides* Hort. nom. nud.
  = Echinocereus kuenzleri.
Echinocereus kunzei Gurke 1907:103-104.
  Type - locality: Arizona, near Phoenix [southern New Mexico according to Britton & Rose 1922:31] ; Kunze (?).
    Nomenclatural synonyms:
      Echinocereus coccineus var. kunzei (Gurke) Backeberg 1960:2070.
        Note: This plant may be a natural hybrid. (see Zimmermann 1993).
Echinocereus laboretianus Daul 1890:76.
  Type - locality: unknown; ? (?).
    Note:Usually considered a synonym of Echinocereus viridiflorus.
Echinocereus labouretianus* Lemaire 1868:57 nom. nud.
  [Probably = Echinocereus laboretianus].
Echinocereus labouretianus var. chrysacanthus* Haage 1900:159 nom. nud.
Echinocereus labouretianus var. gracilispinus* Haage 1900:159 nom. nud.
Echinocereus labouretianus var. sanguineus* Haage 1900:159 nom. nud.
Echinocereus labouretii* Forster ex Haage 1859:19 nom. nud.
Echinocereus labouretii* Forster ex Rumpler 1886:811 pro syn.
  = Echinocereus viridiflorus.
Ecinocereus laboureti var. gracilispinus* Rother 1925:114.
*Echinocereus lamprochlorus = Echinopsis lamprochlora.
Echinocereus laui Frank 1978:74-77.
  Type - locality: Mexico, Sonora, east of Yecora, El Trigo Ranch, 1800m; A. Lau 780, Jan. 1974 (ZSS AA18- 24).
Echinocereus ledingii Peebles 1936:35.
  Type - locality: Arizona, Graham Co., Mt. Graham, 4500 ft.; Louis Wankum, 11 July 1935 (US 1634004).
    Nomenclatural synonyms:
      Echinocereus fendleri var. ledingii (Peebles) Taylor 1985a:253.
Echinocereus leeanus* Lemaire 1868:57 nom. nud.
  [Probably = Echinocereus leeanus Lemaire ex Rumpler].
Echinocereus leeanus (Hooker) Lemaire ex Rumpler 1886:828.
  basionym: Cereus leeanus Hooker 1849:t4417.
    Type - locality: Northern Mexico; ? (?).
      Nomenclatural synonyms:
        Echinocereus polyacanthus var. leeanus* Parker 1996:4 nom. nud.
          Note: Often considered a taxonomic synonym of Echinocereus polyacanthus.
Echinocereus leeanus var. multicostatus (Cels ex Rumpler) Schumann 1897:289.
  = Echinocereus multicostatus.
Echinocereus leonensis Mathsson 1891:66.
  Type - locality: Mexico, Nuevo Leon, near Monterrey; 1800ft. Runge (?).
    Nomenclatural synonyms:
      Echinocereus flaviflorus* Hildmann ex Schumann 1897:264 pro syn.
      Cereus leonensis (Mathsson) Berger 1905:80.
      Echinocereus blanckii var. leonensis (Mathsson) Backeberg1960:1999.
      Echinocereus pentalophus var. leonensis (Mathsson) Taylor 1985b:78.
      Echinocereus pentalophus subsp. leonensis (Mathsson) Taylor 1997:9.
Cereus leptacanthus* De Candolle ex Pfeiffer 1837:101 pro syn.
  = Echinocereus pentalophus var. subarticulatus.
Echinocereus leptacanthus Gaillard 1864:209.
  = Cereus leptacanthus De Candolle ex Salm Dyck 1845:27. nomina nova for Cereus pentalophus var. subarticulatus De Candolle.
Cereus leptacanthus var. crassior* De Candolle ex Forster 1846:373 nom. nud.
Echinocereus leptophus* Gassner Hauptverzeichnis 1937:6 nom. nud.
Echinocereus leucanthus Taylor 1985b:136-137 [New name needed because Echinocereus albiflorus already used].
  basionym: Wilcoxia albiflora Backeberg 1952:16.
    Type - locality: unknown [Probably northwest Sinaloa, Mexico]. (P) [cultivated material from Les Cedres].
Echinocereus leucodictius* Engelmann ex Haage 1859:19 nom. nud.
Echinocereus liebnerianus* Liebner ex Schumann 1896b:262 nom. nud. [Probably a printing error].
  = Echinocereus knippelianus.
*Echinocereus limensis = Haageocereus sp .
Echinocereus lindsayi Meyran 1975:80-83.
  Type - locality: Mexico, Baja Calif. Norte, between Catavina & Laguna Chapala; Meyran et al., 8 May 1975 (MEXU).
    Nomenclatural synonyms:
      Echinocereus ferreirianus var. lindsayi (Meyran) Taylor 1985b:46.
      Echinocereus ferreirianus subsp. lindsayi (Meyran) Taylor 1997:9
Echinocereus llanuraensis (Rutow) W. Blum & D. Felix 2002:3
  = Echinocereus nicholii (Benson) subsp. llanuraensis Rutow
Echinocereus lloydii Britton & Rose 1922:37-38.
  Type - locality: Texas, Pecos Co., Tuna Springs; F.E. Lloyd, 26-28 Feb. 1909 (US 691964).
    Nomenclatural synonyms:
      Echinocereus roetteri var. lloydii (Britton & Rose) Backeberg 1960:2027.
      Echinocereus coccineus fa. lloydii* Parker 1996:4 nom. nud.
      ×Echinocereus lloydii.
        Note: This species is a natural hybrid.
Echinocereus longisetus* Lemaire 1868:57 nom. nud.
  [Probably = Echinocereus longisetus Engelmann ex Rumpler].
Echinocereus longisetus (Engelmann) Engelmann ex Rumpler 1886: 822.
  basionym: Cereus longisetus Engelmann 1856:280. [see Engelmann 1859:32-33, t. 45].
    Type - locality: Mexico, Coahuila, Mtns. near Santa Rosa [Melchor Muzquiz]; J. M. Bigelow, 1853 (MO).
Echinocereus longisetus var. albatus* Sterk 1980:12-13 nom. inval.
  = Echinocereus albatus* Backeberg nom. inval.
Echinocereus longisetus var. delaetii (Gurke) Taylor 1988:79.
  = Echinocereus delaetii.
Echinocereus longisetus subsp. delaetii (Gurke) Taylor 1997:9.
  = Echinocereus delaetii.
Echinocereus longisetus subsp. freudenbergeri (Frank) Blum in Blum et al. 1998a:6. [see Blum et al. 1998b:187].
  = Echinocereus freudenbergeri.
Echinocereus longispinus* Hort. ex Schelle 1926:180 pro syn.
  = Echinocereus acifer.
Echinocereus longispinus Lahman 1950:128. [Originally published Lahman 1936:15 without Latin diagnosis].
  Type - locality: Oklahoma, Mt. Scott; Lahman (MO).
    Note: Usually considered a taxonomic synonym of Echinocereus baileyi.
Echinocereus longispinus var. albispinus* Backeberg 1960:2010 pro syn.
  = Echinocereus albispinus Lahman.
Echinocereus lowryi* Lowry 1936:20 nom. nud.
  [Probably a form of Echinocereus enneacanthus].
Echinocereus luteus Britton & Rose 1913:239.
  Type - locality: Mexico, Sonora, Mtns. above Alamos; Rose et al. 15207, 19 March 1910 (US 535975).
    Nomenclatural synonyms:
      Echinocereus subinermis var. luteus (Britton & Rose) Knuth in Backeberg & Knuth 1935:312.
      Echinocereus subinermis fa. luteus* Parker 1996:4 nom. nud.
Echinocereus madrensis Patoni 1910:42.
  Type - locality: Mexico, Durango, high Sierra Madre; ? (?).
    Nomenclatural synonyms:
      Echinocereus adustus var. schwarzii fa. madrensis* Parker 1996:6. nom. nud.
Echinocereus malibrani* Rebut ex Haage 1892:118 nom. nud.
  [Probably = Echinocereus dubius (According to Schelle 1907:135) ].
Echinocereus mamillatus (Engelmann ex Coulter) Britton & Rose 1922:41.
  basionym: Cereus mamillatus Engelmann ex Coulter 1896:405.
    Type - locality: Mexico, Baja California, south of Mulege, Gabb 16, 1867 (MO).
      Nomenclatural synonyms:
        Echinocereus brandegeei fa. mamillatus* Parker 1996:1 nom. nud.
          Note: Usually considered a taxonomic synonym of Echinocereus brandegeei.
Echinocereus mamillifer* Forster ex Haage 1859:19 nom. nud.
Echinocereus mamilliter* Forster ex Seitz 1870:11 nom. nud.
Echinocereus mamillosus Hort. ex Rumpler 1886:787.
  Type - locality: unknown.
Echinocereus mapimiensis Anderson et al. 1998:284-285.
  Type - locality: Mexico, Coahuila, Bolson de Mapimi, Keil 8136, 22 Aug 1971 (DES).
Echinocereus marginii* Ely 1935:6 nom. nud.
Echinocereus mariae* Backeberg 1965:2, 19 nom. inval. (no type designated).
  Note: A form of Echinocereus baileyi from northwest of Granite, Oklahoma.
Echinocereus maritimus (Jones) Schumann 1897:273-274.
  basionym: Cereus maritimus Jones 1883:973.
    Type - locality: Mexico, Baja California, Norte, near Ensenada; M.E. Jones, April 1882 (POM).
      Nomenclatural synonyms:
        Cereus glomeratus* Orcutt 1897:21 pro syn.
          Note: Echinocereus orcuttii and Echinocereus flaviflorus Coulter ex Schumann are usually considered taxonomic
            synonyms of this species.
Echinocereus maritimus var. hancockii Taylor 1985b:44
  = Echinocereus hancockii.
Echinocereus maritimus subsp. hancockii (Dawson) Blum & Rutow in Blum et al. 1998a:6. [see Blum et al. 1998b:57].
  = Echinocereus hancockii.
Echinocereus marksianus* Schwarz ex Backeberg 1966:124 nom. inval. (no type designated).
  Note: From Northern Mexico. Taylor (1985b) lists this name as a synonym of Echinocereus polyacanthus var. densus.
Echinocereus matlesianus* Backeberg ex Bravo 1991:26 misspelling = Echinocereus matthesianus* Backeberg.
Echinocereus matthesianus* Backeberg 1963:6 nom. inval. (no type designated).
  Note: Taylor (1993) lists this name as a synonym of Echinocereus polyacanthus.
Echinocereus matudae Bravo 1961:119-121.
  Type - locality: Mexico, Chihuhaua, Rio Papigochic near Temosochic; Matuda (MEXU).
    Nomenclatural synonyms:
      Echinocereus arizonicus subsp. matudae (Bravo) Rutow in Lange & Rutow 1994:51.
      Echinocereus coccineus var. arizonicus fa. matudae* Parker 1996:4 nom. nud.
Echinocereus melaleuca* Foster ex Haage 1892:117 nom. nud.
  [Probably= Echinocereus fendleri].
Echinocereus melanacanthus* Engelmann ex Earl 1963:61 printing error.= Echinocereus coccineus.
Echinocereus melanocentrus* Lowry 1936:20 nom. inval. (no Latin diagnosis).
  = Echinocereus melanocentrus* Lowry ex Backeberg.
Echinocereus melanocentrus* Lowry ex Backeberg 1960:2030 nom. inval. (no type designated).
  Note: usually considered a synonym of Echinocereus reichenbachii var. albertii.
Echinocereus merkeri* Hildmann ex Haage 1892:118 nom. nud.
Echinocereus merkeri Hildmann ex Schumann 1897:277.
  Type - locality: unknown [range given as Durango near Cd. Lerdo, Coahuila, Sierra Bola & near Parras].
    Nomenclatural synonyms:
      Echinocereus jacoybi* Hort. ex Schumann 1897:278 pro syn.
      Cereus merkeri (Hildmann ex Schumann) Berger 1905:81.
      Echinocereus enneacanthus fa. merkeri* Parker 1996:2 nom. nud.
        Note: Taylor (1985b) lists this species as a taxonomic synonym of Echinocereus enneacanthus.
Echinocereus merkeri var. densispinus* Schmoll ex Backeberg 1960:2051 nom. nud.
Echinocereus metornii Frank 1990b:210-218.
  Type - locality: Mexico, Coahuila, Sierra Mojada, 1500m, Metorn 49, 4 April 1989 (ZSS).
    Nomenclatural synonyms:
      Echinocereus chisoensis var. metornii* Parker 1996:5 nom. nud.
      Echinocereus fobeanus subsp. metornii (Frank) Blum & Lange in Blum et al. 1998b:307.
        Note: Taylor (1993) lists this species as a taxonomic synonym of Echinocereus fobeanus.
Echinocereus milleri Blum, Kunzler & Oldach. in Blum & Oldach 1999:69-76.
  Type - locality: Robert Lee, Coke Co., Texas. Leuck 229, August 1978 (OKL).
    Nomenclatural synonyms:
      Echinocereus russanthus subsp. milleri* Blum 1997 Seed List nom. nud.
Echinocereus moelleri* Hort. (Cactus & Succulents Journal (US) 13:22 1941) nom. nud.
Echinocereus mojavensis (Engelmann & Bigelow) Engelmann ex Rumpler 1886:803.
  basionym: Cereus mojavensis Engelmann & Bigelow in Engelmann 1856:281.[see Engelmann 1857:33].
    Type - locality: California, Mojave Creek; J.M. Bigelow, 4 March 1854 (MO).
      Nomenclatural synonyms:
        Cereus bigelovii* Engelmann 1856:pl. 4 nom. nud.
        Echinocereus triglochidiatus var. mojavensis (Engelmann & Bigelow) Benson 1944:255.
        Echinocereus coccineus var. mojavensis* Parker 1996:4 nom. nud.
        Echinocereus coccineus subsp. mojavensis (Engelmann & Bigelow) Taylor 1997:8.
        Echinocereus triglochidiatus subsp. mojavensis (Engelmann & Bigelow) Blum & Lange in Blum et al. 1998b:362.
Echinocereus mojavensis var. albispinus* Hort. ex Schelle1926:167 nom. nud.
Echinocereus mojavensis fa. inermis* Mesa Garden Seed Catalog1996 nom. nud.
  = Echinocereus coccineus var. inermis.
Echinocereus mojavensis var. zuniensis (Engelmann & Bigelow) Engelmann ex Rumpler 1886:803.
  basionym: Cereus mojavensis var. zuniensis Engelmann & Bigelow in Engelmann 1856:281.
    Type - locality: Arizona, Canon Diablo, on Little Colorado River; J.M. Bigelow, 14 Dec. 1853 (MO).
      Nomenclatural synonyms:
        Cereus bigelovii var. zuniensis* Engelmann 1857: t. 4 nom. nud.
        Echinocereus zuniensis* Eng. & Big. ex Haage & Schmidt nom. nud.
Echinocereus mombergerianus Frank 1990c:261 (Originally published Frank 1989:272-277 with no type designated).
  Type - locality: Mexico, Baja California Norte, Sierra San Pedro Martir, Hidalgo Observatory; Lau 1248 (ZSS).
    Nomenclatural synonyms:
      Echinocereus polyacanthus var. mombergerianus* Parker1996:4 nom. nud.
      Echinocereus polyacanthus subsp. mombergerianus (Frank) Breckwoldt & Matylewicz 1996:15.
      Echinocereus pacificus subsp. mombergerianus Blum, Rischer & Rutow in Blum et al. 1998b:418.
Echinocereus monacanthus Heese 1904:215.
  Type - locality: Texas - Mexico Border, Rancho Tacubaya.
    Note: Usually considered a taxonomic synonym of Echinocereus paucispinus.