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Echinocereus reichenbachii (Terscheck ex Walpers) Haage Jr. ex Britton & Rose 1922:25.
  = Echinocactus reichenbachii Terscheck ex Walpers 1843:320 (Terscheck Verzeichnis 2. According to Schumann 1897:452).
    Type - locality: Mexico.; ? (?).
      Nomenclatural synonyms:
        Echinocereus pectinatus var. reichenbachii (Terscheck ex Walpers) Werdermann 1930:t5.
        Echinocereus caespitosus var. reichenbachii* Ters. ex Borg 1937:174 nom. illegit.
          Note: Since Terscheck's Original publication has not been found there is confusion concerning whether the two names
            Echinocactus reichenbachii and Echinocactus reichenbachianus refer to the same plant. The name Echinocereus
            reichenbachii is usually applied to Echinocereus caespitosus although this is uncertain since the original description of
            Echinocactus reichenbachii did not have a description of the plant's flower, and no collector or exact type locality is listed.
            Benson (1982:946) designated Palmer 511, near Saltillo, Mexico, 10 April 1905 (US 570013) as the neotype. Unless
            someone is able tolocate a copy of Terscheck's original publication questions will remain concerning the proper use of this
            name.
Echinocereus reichenbachii var. albertii Benson 1969d:127.
  Type - locality: Texas, Jim Wells Co., near Alice; Benson 16,550 (POM 317080).
    Nomenclatural synonyms:
      Echinocereus reichenbachii var. fitchii fa. albertii* Parker 1996:5 nom. nud.
      Echinocereus fitchii var. albertii* Mesa Garden Seed Catalog1996 nom. nud.
      Echinocereus fitchii subsp. alberti (Benson) Blum & Lange in Blum et al. 1998a:5. [see Blum et al. 1998b:313].
      Echinocereus reichenbachii subsp. albertii (L.D.Benson) Pilbeam 2011:117.
        Note: Echinocereus melanocentrus* Lowry 1936:20 is usually considered a synonym of this variety.
Echinocereus reichenbachii subsp. albertii (L.D.Benson) Pilbeam 2011:117.
  = Echinocereus reichenbachii var. albertii Benson 1969d:127.
Echinocereus reichenbachii var. albiflorus* Seela 1940:92 nom. nud.
Echinocereus reichenbachii var. albispinus (Lahman) Benson1969d:127.
  = Echinocereus albispinus Lahman 1935:143.
    Note: Benson uses this name instead of Echinocereus baileyi.
Echinocereus reichenbachii var. anigosanthus* Ito 1981. nom. nud.
Echinocereus reichenbachii var. armatus (Poselger) Taylor 1985b:133.
  = Echinocereus pectinatus var. armatus.
Echinocereus reichenbachii subsp. armatus (Poselger) Taylor 1997:9
Echinocereus pectinatus var. armatus.
Echinocereus reichenbachii var. aureiflorus* Seela 1940:92 nom. nud.
Echinocereus reichenbachii var. baileyi (Rose) Taylor 1985b:133.
  = Echinocereus baileyi.
Echinocereus reichenbachii subsp. baileyi (Rose) Taylor 1997:9.
  = Echinocereus baileyi.
Echinocereus reichenbachii var. baileyi fa. albispinus* Mesa Garden Seed Catalog 1996 nom. nud.
  = Echinocereus albuspinus.
Echinocereus reichenbachii subsp. burrensis Frank, 2000:77.
  Type - locality: Serranias del Burro, Coahuila, MX; G. R. W. Frank 042 (ZSS).
Echinocereus reichenbachii var. caespitosus* Mesa Garden Seed Catalog 1996 nom. nud.
Echinocereus reichenbachii fa. caespitosus* Parker 1996:5 nom. nud.
  = Echinocereus caespitosus.
Echinocereus reichenbachii subsp. caespitosus Blum & Lange in Blum et al.1998:324.
  = Echinocereus caespitosus.
Echinocereus reichenbachii var. chisoensis (Marshall) Benson 1969d:127.
  = Echinocereus chisoensis.
Echinocereus reichenbachii subsp. comanchensis Felix , Oldach & J. Oldach in  Blum et al. 2005:209 (-222; figs.).
  Type - locality: Comanche County, north of Lake Lawtonka, T. & J. Oldach 0229, 15 June 1990 (ZSS AX24462).
Echinocereus reichenbachii var. fitchii (Britton & Rose) Benson 1969d:127.
  = Echinocereus fitchii.
Echinocereus reichenbachii subsp. fitchii (Britton & Rose) Taylor 1997:9.
  = Echinocereus fitchii.
Echinocereus reichenbachii var. fitchii fa. albertii* Parker 1996:5 nom. nud.
  = Echinocereus reichenbachii var. albertii.
Echinocereus reichenbachii var. fitchii fa. melanocentrus* Parker 1996:5 nom. nud.
  = Echinocereus melanocentrus*.
Echinocereus reichenbachii fa. pailanus* Parker 1996:5 nom. nud.
Echinocereus reichenbachii var. perbellus (Britton & Rose) Benson 1969d:127.
  = Echinocereus perbellus.
Echinocereus reichenbachii subsp. perbellus* Blum 1997 Seed List nom. nud.
  = Echinocereus perbellus.
Echinocereus reichenbachii var. purpureus* Parker 1996:5 nom. nud.
  = Echinocereus purpureus.
*Echinocereus reichii (from Chile and therefor not an Echinocereus).
Echinocereus relictus B. Wellard, sp. nov. (Figs. 3, 4).
  Type - UTAH: “Limestone Road” S of Sun River Community, 1.25 mi N
  of Utah/Arizona border, 1 mi W of Port of Entry, 795 m, 37.018198°, -113.632523°, 14 Apr 2016, B. Wellard 578 with K. Wellard (holotype:
  UT; isotype: ASU).
  = Echinocereus engelmannii var. purpureus L.D. Benson
Echinocereus rigidispinus* Engelmann ex Haage 1859:20 nom. nud.
Echinocereus rigidissimus Hort. ex F. A. Haage 1897:13.
  = Echinocereus pectinatus var. rigidissimus.
Echinocereus rigidissimus* Rose 1909a:293 nom. illegit.(later homonym).
  = Echinocereus pectinatus var. rigidissimus.
Echinocereus rigidissimus var. rubispinus (Frank & Lau) Taylor 1984:175.
  = Echinocereus pectinatus var. rubispinus Frank & Lau 1982:32-35.
Echinocereus rigidissimus subsp. rubispinus (Frank & Lau) Taylor 1997:9.
  = Echinocereus pectinatus var. rubispinus.
Echinocereus rischeri (R.C.Romer) W.Rischer 2007:118
  = Echinocereus scheeri subsp. rischeri R.C.Romer 2004:8.
Echinocereus ritteri* Haage 1958:182 nom. nud. [A form of Echinocereus pentalophus]
Echinocereus robustior* Britton & Rose 1922:28 pro syn.
  = Echinocereus pectinatus var. rigidissimus.
Echinocereus robustus (Peebles) Peebles 1940:219.
  basionym: Echinocereus rectispinus var. robustus Peebles 1938:675.
    Type - locality: Arizona, Pima Co. Between Tucson & Sabino Canyon; Peebles SF896, 27 Aug 1935 (US 1729267).
      Nomenclatural synonyms:
        Echinocereus fendleri var. robustus* Benson 1944:259 nom. illegit. (later homonym).
        Echinocereus fasciculatus fa. robustus* Parker 1996:2 nom. nud.
          Note: This plant is usually treated as a taxonomic synonym of Echinocereus fasciculatus.
Echinocereus roemeri* Lemaire 1868:56 nom. nud.
Echinocereus roemeri (Engelmann) Engelmann ex Haage 1859:20.
  basionym: Cereus roemeri Engelmann 1849:50. [not Muhlenpfordt].
    Type - locality: Texas, granitic region of the Llano. Lindheimer, 1847 (MO).
      Nomenclatural synonyms:
        Echinocereus coccineus fa. roemeri* Parker 1996:4 nom. nud.
        Echinocereus roemeri Engelmann ex Rumpler 1886:792.
Echinocereus roemeri* (Muhlenpfordt) Rydberg 1906:146 nom. illeg.
  basionym: Cereus roemeri Muhlenpfordt 1848:19. [not Engelmann].
    Type - locality: Northern Texas; Roemer (?).
      Nomenclatural synonyms:
        Echinocereus coccineus subsp. roemeri Blum, Lange & Rutow in Blum et al.1998:433.
Echinocereus roetteri (Engelmann) Engelmann ex Rumpler 1886:829-830.
  basionym: Cereus roetteri Engelmann 1856:345. [see Engelmann 1859:33, t. 41, fig. 3-5].
    Type - locality: Texas, stony hills near Frontera [El Paso]; Wright, 1851 (MO 2016865).
      Nomenclatural synonyms:
        Cereus dasyacanthus var. minor* Engelmann 1856:278.
        Echinocereus pectinatus var. minor (Engelmann) Benson 1968:125.
        Echinocereus dasyacanthus fa. roetteri* Parker 1996:2 nom. nud.
          Note: This plant is probably a natural hybrid.
Echinocereus roetteri var. lloydii (Britton & Rose) Backeberg 1960:2027.
  = Echinocereus lloydii.
Echinocereus roetteri var. neomexicanus ( J.M.Coult. ) A.D.Zimmerman in Powell & Weedin 2004:211 pro sp. hybr.
  = Echinocereus pectinatus var. neomexicanus (J.M.Coult.) L.D.Benson 1944.
Echinocereus roseanus* Backeberg 1937:21 nom. nud.
Echinocereus roseanus* Backeberg 1960:2071 pro syn.
  = Echinocereus rosei.
Echinocereus rosei Wooten & Standley 1915:457.
  Type - locality: New Mexico, Dona Ana Co., hills near Agricultural College [Las Cruces]; Standley 1235, 1907 (US 535093).
    Nomenclatural synonyms:
      Echinocereus triglochidiatus var. rosei (Wooten & Standley) Marshall 1950:63.
      Echinocereus roseanus* Backeberg 1960:2071 pro syn.
      Echinocereus polyacanthus var. rosei* Weniger 1970:44 nom. inval.
      Echinocereus coccineus fa. rosei* Blum 1990:13 nom. inval.
      Echinocereus triglochidiatus var. neomexicanus fa. rosei* Blum 1990:12. pro syn.
      Echinocereus coccineus var. neomexicanus fa. rosei* Parker 1996:4 nom. nud.
      Echinocereus coccineus subsp. rosei Blum & Rutow in Blum et al. 1998b:426.
      Echinocereus coccineus var. rosei Zimmerman ex Powell & Weedin 2004:203.
        Note: This plant is often listed under the name Echinocereus triglochidiatus var. neomexicanus the type of which is probably
          a natural hybrid.
Echinocereus rosei var. jarillensis* Kunzler Cat. nom. nud.
Echinocereus rotatus Linke 1858:85.
  Type - locality: South Texas; ? (?).
    Nomenclatural synonyms:
      Echinocereus pectinatus var. rotatus (Linke) Linke ex Haage 1892:118.
        Note: This name is usually consisdered a taxonomic synonym of Echinocereus caespitosus.
Echinocereus rubescens Dams 1905:92 -93.
  Type - locality: unknown; ? (?).
    Note: This species is often considered to be a taxonomic synonym of Echinocereus dasyacanthus.
Echinocereus rufispinus Engelmann 1848a:104-105.
  Type - locality:Mexico, Chihuahua, Cosihuiriachi; Wislizenus, 19 May 1848 (MO 2016892).
    Nomenclatural synonyms:
      Cereus rufispinus (Engelmann) Engelmann 1849:50.
      Cereus pectinatus fa. rufispinus (Engelmann) Voss 1894:378.
      Echinocereus adustus var. schwarzii fa. rufispina* Parker 1996:6 nom. nud.
        Note: Usually considered a taxonomic synonym of Echinocereus adustus.
Echinocereus rungei Schumann 1895:124. [This is a new name for Echinocereus texensis* Runge].
  Type - locality: Texas; Runge. (?).
    Nomenclatural synonyms:
      Echinocereus texensis* Runge 1894:61. nom. illegit.(later homonym).
        Note: The plant is usually considered a taxonomic synonym of Echinocereus papillosus.
Echinocereus runyonii Orcutt 1926:5.
  Type - locality: Texas, mouth of Rio Grande River, Orcutt 1048, 1924 (?).
    Note: This plant is probably the same as Echinocereus procumbens.
Echinocereus russanthus Weniger 1969:41-42.
  Type - locality: Texas, Brewster Co., Christmas Mtns.; Weniger 712, (UNM).
    Nomenclatural synonyms:
      Echinocereus chloranthus var. russanthus (Weniger) Lamb ex Rowley 1974:7.
      Echinocereus viridiflorus var. russanthus (Weniger) Leuck 1980:34.
        Note: Echinocereus chloranthus var. vulpis-cauda* is probably a synonym of this species
Echinocereus russanthus var. cowperi* Hort. [HK 1287, from Cooks Range, Luna County,New Mexico].
  = Echinocereus chloranthus subsp. rhyolithensis.
Echinocereus russanthus var. fiehnii Trocha 1997:65-69.
  Type - locality: Mexico, Chihuahua, Canon de Santa Clara, Sierra del Nido; Lau 1076 (HBG1066).
    Nomenclatural synonyms:
      Echinocereus russanthus var. finnii* Kohres Catalog 1981. nom. nud.
      Echinocereus finnii* Hort. ex Taylor 1985 101 pro syn.
      Echinocereus fiehnii* Lau 1992:74.
      Echinocereus russanthus fa. finnii* Parker 1996:3 nom. nud.
      Echinocereus russanthus subsp. fiehnii (Trocha) Blum & Lange in Blum et al.1998:212.
Echinocereus russanthus subsp. fiehnii (Trocha) Blum & Lange in Blum et al.1998:212.
  = Echinocereus russanthus var. fiehnii.
Echinocereus russanthus var. finnii* Kohres Catalog 1981. nom. nud.
  = Echinocereus russanthus var. fiehnii.
Echinocereus russanthus fa. finnii* Parker 1996:3 nom. nud.
  = Echinocereus russanthus var. fiehnii.
Echinocereus russanthus subsp. milleri* Blum 1997 Seed List nom. nud.
  = Echinocereus milleri.
Echinocereus russanthus var. neocapillus* Mesa Garden Seed Catalog 1996 nom. nud.
  = Echinocereus chloranthus var. neocapillus.
Echinocereus russanthus var. vulpis-cauda* Kohres Catalog 1981 nom. nud.
  = Echinocereus chloranthus var. vulpis-cauda*
Echinocereus russanthus fa. vulpis-cauda* Parker 1996:3 nom. nud.
  = Echinocereus chloranthus var. vulpis-cauda*
Echinocereus russanthus var. weedinii* Mesa Garden Seed Catalog 1996 nom. nud.
  = Echinocereus viridiflorus var. weedinii.
Echinocereus russanthus subsp. weedinii Leuck ex Blum & Lange in Blum et al. 1998b:214-216.
  Type - locality: Texas, Jeff Davis Co., top of Timber Mtn. , 6400 ft.; Leuck & Weedin 193, 13 May 1978 (OKL).
    Nomenclatural synonyms:
      Echinocereus chloranthus var. livermorensis* Kolle 1978:34 nom. inval. (not published in printed form).
      Echinocereus viridiflorus var. weedinii Leuck 1980:37-39 nom. inval.
      Echinocereus russanthus var. weedinii* Mesa Garden Seed Catalog 1996 nom. nud.
      Echinocereus chloranthus subsp. weedinii* Hochstatter Seed List 1997 nom. nud.
      Echinocereus viridiflorus var. weedinii ( Leuck ex Blum & Lange ) A.D. Zimmerman 2004: 270.
Echinocereus salm-dyckianus Scheer 1856:291.
  Type - locality: Mexico, Chihuahua; ? (?).
    Nomenclatural synonyms:
      Cereus salm-dyckianus (Scheer) Hemsley 1880:545.
      Echinocereus scheeri var. salm-dyckianus* Anett ex Parker 1996:4 nom. nud.
Echinocereus salm-dyckianus subsp. bacanorensis Rischer & Trocha 1998:3-10.
  Type - locality: Mexico, Sonora, near Bacanora; Trocha AX18239 (ZSS).
    Nomenclatural synonyms:
Echinocereus klapperi subsp. bacanorensis (Rischer) Fursch & Rischer 2003.
Echinocereus santaritensis subsp. bacanorensis (Rischer) Rischer & Felix 2006.
Echinocereus salm-dyckianus var. gracilior* Haage 1900:161 nom. nud.
Echinocereus salm-dyckianus var. gracilior Hort. ex Schelle 1926:163.
  Type - locality: unknown; ? (?).
Echinocereus salm-dyckianus var. noctiflorus Heid 1944:27.
  Type - locality: Mexico, Chihuahua, Cerocauhui; R. T. Craig (CA 305550).
Echinocereus salm-dyckianus subsp. obscuriensis Blum 1994:79-83.
  = Echinocereus scheeri var. obscuriensis.
Echinocereus salmianus Hort. ex Rumpler 1886:809.
  Type - locality: unknown; ? (?).
    Nomenclatural synonyms:
      Cereus salmianus (Hort. ex Rumpler) Weber in Bois 1894:279.
Echinocereus scheeri fa. salmianus* Parker 1996:4 nom. nud.
Echinocereus saltillensis* Mats. ex Haage 1900:161 nom. nud.
Echinocereus sanborgianus (Coulter) Schumann 1897:174.
  basionym: Cereus sanborgianus Coulter 1896:391.
    Type - locality: Mexico, Baja California, rocky table lands south of San Borja; Gabb 9, 1867 (MO).
      Nomenclatural synonyms:
        Echinocereus brandegeei fa. sanborgianus* Parker 1996:1 nom. nud.
          Note: Usually considered a taxonomic synonym of Echinocereus brandegeei.
Echinocereus sandersii Orcutt 1926:5.
  Type - locality: California, Black Canyon, Providence Mountains, 5000ft; Gibson & Sanders, 1925 (?).
    Note: Usually considered a synonym of taxonomic Echinocereus mojavensis.
Echinocereus sangre de christo Schumann 1897:278.
  Type - locality: Mexico, Mexico, near Pachuca; ; ? (?).
Echinocereus sanguineus Blanc 1890:58.
  Type - locality: unknown; ? (?).
    Note: Probably a form of Echinocereus viridiflorus.
Echinocereus sanpedroensis* Raudonat & Rischer 1995:88-97. nom. inval. (type contains two gatherings)
  Type - locality: Mexico, Sonora, Rancho San Pedro, Rischer, May 1995 (ZSS).
Echinocereus sanpedroensis Raudonat & Rischer 2002:54
  Type - locality:Mexico, Sonora, Rancho San Pedro; Rischer 253 (ZSS).
    Note: Echinocereus subterraneus* Backeberg 1960:2012 is sometimes listed as a synonym of this plant.
Echinocereus santaritensis Blum & Rutow in Blum et al. 1998:373-375.
  Type - locality: Arizona, Santa Rita Mountains; Rutow 52-56, 16 Apr. 1996 (UA).
Echinocereus santaritensis subsp. bacanorensis (Rischer) Rischer & Felix 2006:91.
  = Echinocereus salm-dyckianus subsp. bacanorensis Rischer & Trocha 1998:3-10.
Echinocereus sarissophorus Britton & Rose 1922:38-39.
  Type - locality: Mexico, Coahuila, near Saltillo; Palmer 100, Apr. 1898 (US).
    Nomenclatural synonyms:
      Echinocereus enneacanthus fa. sarissophorus* Parker 1996:2 nom. nud.
Echinocereus scheeri* Lemaire 1868:57 nom. nud.
  [Probably = Echinocereus scheeri Salm-Dyck ex Scheer].
Echinocereus scheeri (Salm-Dyck) Salm-Dyck ex Scheer 1856:291.
  basionym: Cereus scheeri Salm-Dyck 1850:190-191.
    Type - locality: Mexico, Chihuahua; Potts (?).
      Nomenclatural synonyms:
        Echinocereus schlini* Britton & Rose 1922:43 pro syn.
Echinocereus scheeri var. australis* Taylor 1988:80 pro syn.
  = Echinocereus scheeri var. koehresianus.
Echinocereus scheeri var. compactus* Hort. ex Haage 1897:13 nom. nud.
Echinocereus scheeri var. gentryi (Clover) Taylor 1984:154.
  = Echinocereus gentryi.
Echinocereus scheeri subsp. gentryi (Clover) Taylor 1997:9.
  = Echinocereus gentryi.
Echinocereus scheeri var. gentryi cultivar 'Cucumis' (Clover) Taylor 1984:155.
  = Echinocereus cucumis.
Echinocereus scheeri var. gentryi fa. cucumis* Parker 1996:4 nom. nud. = Echinocereus cucumis.
Echinocereus scheeri var. gracilior Hildmann ex Schelle 1926:162.
  Type - locality: unknown; ? (?).
Echinocereus scheeri var. koehresianus Frank 1988:186-189.
  Type - locality: Mexico, Durango, between El Carrizo & Loberas; Lau 1143 (ZSS).
    Nomenclatural synonyms:
      Echinocereus koehresianus* Hort. ex Taylor 1988:80 pro syn.
      Echinocereus koehresii* Hort. ex Taylor 1988:80 pro syn.
      Echinocereus scheeri var. australis* Taylor 1988:80 pro syn.
      Echinocereus ortegae subsp. koehresianus (Frank) Rischer & Frank 1996:93.
      Echinocereus ortegae fa. koehresianus* Parker 1996:4 nom. nud.
        Note: Taylor (1993) lists this species as a taxonomic synonym of Echinocereus ortegae.
Echinocereus scheeri var. major Rother 1905:175.
  Type - locality: unknown; ? (?).
Echinocereus scheeri var. minor Rother 1905:175.
  Type - locality: unknown; ? (?).
Echinocereus scheeri var. nigrispinus* Scheer 1856:291 nom. nud.
Echinocereus scheeri var. obscuriensis Lau 1989:34-36.
  Type - locality: Mexico, Chihuahua, Sierra Obscura; Lau 091 (ZSS).
    Nomenclatural synonyms:
      Echinocereus salm-dyckianus subsp. obscuriensis (Lau) Blum 1994:79.
Echinocereus scheeri var. salm-dyckianus fa. obscuriensis* Parker 1996:4 nom. nud.
Echinocereus scheeri var. obscuriensis* Lau in Guzman et al. 2003a:78 (without basionym).
Echinocereus scheeri subsp. obscuriensis (Lau) Guzman 2003b:17.
  = Echinocereus scheeri var. obscuriensis Lau published without basionym in Guzman et al. 2003a:78.
Echinocereus scheeri subsp. paridensis Rischer & Trocha 1998:58-65.
  Type - locality: Mexico , Sinaloa, Near Parida; Rischer 1992/312, 1992 (ZSS AX 18719).
Echinocereus scheeri subsp. polyacanthoides* Momberger 1994:58. nom. prov. (from Tomochic, Chihuahua, Mexico).
Echinocereus scheeri subsp. rischeri R.C.Romer 2004:8.
  Type - locality: Mexico, Chihuahua, Municipio Guachochi, Cumbres de Sinforosa; Werner Rischer WR 605 (UAT).
Echinocereus scheeri var. robustior Rother 1902:59.
  Type - locality: unknown; ? (?).
Echinocereus scheeri var. salm-dyckianus* Anett ex Parker 1996:4 nom. nud.
  = Echinocereus salm-dyckianus.
Echinocereus scheeri var. salm-dyckianus fa. obscuriensis* Parker 1996:4 nom. nud.
  = Echinocereus scheeri var. obscuriensis.
Echinocereus scheeri fa. salmianus* Parker 1996:4 nom. nud.
  = Echinocereus salmianus.
Echinocereus schereri Frank 1990a:154-159.
  Type - locality: Mexico, Durango,near Las Minas, Rio Nazas; Scherer 123 (ZSS).
Echinocereus schlechterdalii* Britton & Rose 1922:302 error for Echinocactus schlechtendalii.
Echinocereus schlini* Britton & Rose 1922:43 pro syn.
  = Echinocereus scheeri.
Echinocereus schmollii (Weingart) Taylor 1985b:140.
  basionym: Cereus schmollii Weingart 1931:251-252.
    Type - locality: Mexico, Queretero; F. Schmoll (?).
      Nomenclatural synonyms:
        Wilcoxia schmollii (Weingart) Backeberg 1935, Blatter fur Kakteenforschung. 2(11) :93.
          Note: Wilcoxia nerispina* Backeberg 1960:2078 nom. invalid. is usually considered a synonym of this species.
Wilcoxia schmollii var. lanata* Cartier 1980, Succulentes 2(4) :8 nom. inval.
Echinocereus schmollii fa. nerispina* Parker 1991:6 nom. nud.
  = Wilcoxia nerispina*
Echinocereus schwarzii* Backeberg 1960:2032 pro syn.
  = Echinocereus radians.
Echinocereus schwarzii Lau 1982:27-29.
  Type - locality: Mexico, Durango, near Guenacevi, 1800-2100 m.; Lau 1305 (POM).
    Nomenclatural synonyms:
      Echinocereus adustus var. schwarzii (Lau) Taylor 1985a:268.
      Echinocereus adustus subsp. schwarzii (Lau) Taylor 1992:8.
Echinocereus sciurus (K. Brandegee) K. Brandegee ex Dams 1904:130.
  basionym: Cereus sciurus K. Brandegee 1904:192.
    Type - locality: Mexico, Baja California Sur, hills near San Jose del Cabo; T.S. Brandegee, April 1897 (UC).
Echinocereus sciurus var. floresii (Backeberg) Taylor 1985b:115.
  = Echinocereus floresii.
Echinocereus sciurus subsp. floresii (Backeberg) Taylor 1997:10.
  = Echinocereus floresii.
Echinocereus sciurus var. floresii fa. townsendianus* Parker 1996:5 nom. nud.
  = Echinocereus townsendianus*
Echinocereus scopulorum Britton & Rose 1922:30-31.
  Type - locality: Mexico, Sonora, near Guaymas; Rose et al 12570, 10 March 1910 (US).
    Nomenclatural synonyms:
      Echinocereus pectinatus var. scopulorum (Britton & Rose) Marshall 1955:61.
Echinocereus scopulorum subsp. pseudopectinatus Blum & Lange in Blum et al. 1998b:342.
  = Echinocereus pseudopectinatus.
*Echinocereus serpentinus Lemaire= Nyctocereus serpentinus.
Echinocereus setosus* Hort. ex Taylor 1988:76 pro syn.
  = Echinocereus freudenbergeri.
Cereus similis* Regel & Klein 1860:29. according to Hemsley 1880:546, but not found on that page.
  Type - locality: Mexico; Karwinsky (?).
    Note: Perhaps this is the same as Cereus similis Meinshausen 1858 in Wochenschrift für Gärtnerei und Pflanzenkunde 1:29].
*Echinocereus spachianus Rumpler = Echinopsis spachiana.
*Echinocereus spinibarbis Salm Dyck = Eulychnia spinibarbis.
Echinocereus spinibarbis* Haage 1900:161 nom. nud.
Echinocereus spinibarbis* Hildmann ex Fobe 1911:58 nom. illegit. (later homonym).
Echinocereus spinigemmatus Lau 1984:248-250.
  Type - locality: Mexico, Jalisco, near San Andres Cohamiata, 1600 m.; Lau 1246, 25 Apr. 1974 (ZSS AA18- 48).
Echinocereus spinosissimus Walton 1899a:162.
  Type - locality: Texas, El Paso; ? (?).
    Note: Usually considered a taxonomic synonym of Echinocereus dasyacanthus.
Echinocereus spinosissimus var. ctenoides* (Engelmann) Ito 1981:237. nom. inval. (no basionym).
  = Echinocereus ctenoides.
Echinocereus spinosissimus var  steereae* (Clover) Ito 1981:237. nom. inval. (no basionym).
  = Echinocereus steereae Clover.
Echinocereus spinosus* Coulter ex Schelle 1926:174 pro syn.
  = Echinocereus pectinatus var. armatus.
*Echinocereus splendens Lemaire.
  = Nyctocereus splendens.
Echinocereus standleyi Britton & Rose 1922:24.
  Type - locality: New Mexico, Sacramento Mtns.,100 miles north of El Paso; S. L. Pattison (US).
    Nomenclatural synonyms:
      Echinocereus viridiflorus var. standleyi (Britton & Rose) Orcutt ex Weniger 1969:37.
      Echinocereus viridiflorus fa. standleyi* Parker 1996:3 nom. nud.
Echinocereus steereae Clover 1938:565-567.
  Type - locality: Texas, Chisos Mtns.; Mrs Lois Steere (MICH).
    Nomenclatural synonyms:
      Echinocereus dasyacanthus var. steereae (Clover) Marshall 1945:115.
      Echinocereus pectinatus var. steereae* Rumpler ex Weniger 1970:32 pro syn.
      Echinocereus spinosissimus var  steereae* (Clover) Ito 1981:237. nom. inval. (no basionym).
      Echinocereus dasyacanthus fa. steereae* Parker 1996:2 nom. nud.
Echinocereus stoloniferus Marshall 1938:159-160.
  Type - locality: Mexico, Sonora, Mountain facing Rancho Guirocoba, 5000 ft.; Bristol & Marshall, 19 Mar. 1935 (DS 251176).
    Nomenclatural synonyms:
      Echinocereus subterraneus* Hort. ex Bailey 1941:271. pro. syn.
Echinocereus stoloniferus var. tayopensis (Marshall) Taylor 1985a:258.
  = Echinocereus tayopensis.
Echinocereus stoloniferus subsp. tayopensis* (Marshall) Pichler 1994:103-106. nom. inval.
  = Echinocereus tayopensis.
Echinocereus stoloniferus subsp. tayopensis (Marshall) Taylor 1997:10.
  = Echinocereus tayopensis.
Echinocereus stramineus (Engelmann) Engelmann ex Seitz 1870:11.
  basionym: Cereus stramineus Engelmann 1856:282. [see Engelmann 1859:35, t. 46].
    Type - locality: Texas, Mtns near El Paso; Wright, 1851 (MO).
      Nomenclatural synonyms:
        Echinocereus enneacanthus var. stramineus (Engelmann) Benson 1969d:127.
          Note:Usually cited as Echinocereus stramineus Engelmann ex Rumpler 1886:797.
Echinocereus stramineus var. conglomeratus (Blanc) Bravo 1974:47
  = Echinocereus conglomeratus.
Echinocereus stramineus fa. conglomeratus* Parker 1996:3 nom. nud.
  = Echinocereus conglomeratus.
Echinocereus stramineus var. major* Haage 1897:13 nom. nud.
Echinocereus stramineus fa. major* Schelle 1907:136 nom. nud.
Echinocereus stramineus var. major-aureispina* Frič 1924:121 nom. nud.
Echinocereus stramineus var. occidentalis Taylor 1988:70-71.
  Type - locality: Mexico, Durango, southeast of La Cuesta, 140 km north of city of Durango, on volcanic rocks, 1400-1450 m.;
    N.P.Taylor 240b, 1 July 1986 (MEXU).
  Nomenclatural synonyms:
    Echinocereus stramineus subsp. occidentalis (Taylor) Taylor 1997:10.
    Echinocereus occidentalis (Taylor) Richer et al. 2009:23.
Echinocereus stramineus subsp. occidentalis (Taylor) Taylor 1997:10.
  = Echinocereus stramineus var. occidentalis.
Echinocereus stramineus var. parkeri* Seed list 1996 - British Cactus and Succulent Journal. = Echinocereus parkeri.
Echinocereus stramineus var. ruberrimus* Frič 1924:121 nom. nud.
Echinocereus stramineus var. spinarosa* Frič 1924:121 nom. nud.
Echinocereus strausianus Haage ex Quehl 1900:70-71.
  Type - locality: Texas; ? (?).
    Note: Usually considered a taxonomic synonym of Echinocereus viridiflorus var. cylindricus.
*Echinocereus strigosus Lemaire = Echinopsis strigosa.
Echinocereus subinermis Salm-Dyck ex Scheer 1856:291.
  Type - locality: Mexico, Chihuahua, Potts (?).
    Nomenclatural synonyms:
      Cereus subinermis (Salm-Dyck ex Scheer) Hemsley 1880:546.
Echinocereus subinermis var. aculeatus Unger 1984:164.
  Type - locality: Mexico, Chihuahua, Rio Batopilas near la Bufa; 700m, Unger, 1980 (ZSS AA50- 70).
    Nomenclatural synonyms:
      Echinocereus subinermis fa. aculeatus* Parker 1996:4 nom. nud.
Echinocereus subinermis fa. aculeatus* Parker 1996:4 nom. nud.
  = Echinocereus subinermis var. aculeatus.
Echinocereus subinermis var. luteus (Britton & Rose) Knuth in Backeberg & Knuth 1935:312.
  = Echinocereus luteus.
Echinocereus subinermis fa. luteus (Britton & Rose) Krainz 1967:51.
  = Echinocereus luteus.
Echinocereus subinermis var. ochoterenae Unger 1984:164.
  = Echinocereus ochoterenae.
Echinocereus subinermis subsp. ochoterenae (Ortega) Taylor 1997:10.
  = Echinocereus ochoterenae.
Echinocereus subterraneus* Hort. ex Bailey 1941:271 pro syn.
  = Echinocereus stoloniferus.
Echinocereus subterraneus* Backeberg 1937:21 nom. nud.
Echinocereus subterraneus* Backeberg 1960:2012 nom. inval. (no type designated).
  Type - locality: Mexico [See Echinocereus sanpedroensis].
Echinocereus tamaulipensis* Frič 1926:441 nom. nud.
  [probably = Echinocereus pectinatus var. tamaulipensis].
Echinocereus tamaulipensis (Werdermann) Lange 1995:139-140.
  = Wilcoxia tamaulipensis Werdermann 1938:86.
    Type - locality: Mexico, Southern Coahuila, Hummel s.n. (B).
      Nomenclatural synonyms:
        Echinocereus poselgeri fa. tamaulipensis* Parker 1996:6 nom. nud.
Echinocereus tamaulipensis subsp. deherdtii Lange 1995:140-141.
  Type - locality: Mexico, Coahuila, El Sol; Lange (JE).
    Nomenclatural synonyms:
      Echinocereus poselgeri var. waldeisii fa. deherdtii* Parker 1996:6 nom. nud.
Echinocereus tamaulipensis subsp. waldeisii (Haugg) Lange 1995:142.
  = Echinocereus waldeisii.
Echinocereus tayopensis Marshall 1956a:78-80.
  Type - locality: Mexico, Sonora, Rancho Saucito, between Bacadehuachi & Nacori Chico, 3500 ft (29o42'N 109o04'W); D. Gold & Sanchez-Mejorada (DES).
    Nomenclatural synonyms:
      Echinocereus stoloniferus var. tayopensis (Marshall) Taylor 1985a:258.
      Echinocereus stoloniferus subsp. tayopensis (Marshall) Pichler 1994:103-106.
Echinocereus texensis Jacobi 1856:110. [not Runge 1894].
  Type - locality: Texas.
    Note: This name is usually considered a taxonomic synonym of Echinocereus caespitosus.
Echinocereus texensis* Runge 1894:61-62 nom. illegit. (later homonym).
  [See Echinocereus rungei.]
Echinocereus thurberi* Monatschrift für Kakteenkunde 3:153. error for Cereus thurberi.
Echinocereus topiensis Rischer & Trocha 1999:9.
  Type - locality: Mexico, Durango, Topia; Anon 1992/292 (HBG 1118).
    Nomenclatural synonyms:
      Echinocereus acifer subsp. topiensis (W. Rischer & Trocha) W. Rischer 2004:88.
Echinocereus toroweapensis (Fischer) Fuersch 1993:266-268.
  = Echinocereus triglochidiatus var. toroweapensis.
Echinocereus townsendianus* Heyer 1989:26 nom. nud.
  [a form of Echinocereus floresii].
Echinocereus thwaitesii* Schumann 1897:290 nom. nud.
Echinocereus trichacanthus Rumpler 1886:799.
  Type - locality: unknown; ? (?).
*Echinocereus trichacanthus Engelmann ex Haage 1893:23.
  = Cephalocereus nobilis.
Echinocereus triglochidiatus Engelmann 1848a:93.
  Type - locality: New Mexico, Wolf Creek; Wislizenus 516, 24 June 1846 (MO 2016786).
    Nomenclatural synonyms:
      Cereus triglochidiatus (Engelmann) Engelmann 1849:50.
      Echinocereus paucispinus var. triglochidiatus* Schumann 1897:281 nom. illegit.
Echinocereus triglochidiatus var. acifer (Jacobi) Bravo 1978:66.
  = Echinocereus acifer.
Echinocereus triglochidiatus subsp. acifer (Otto ex Salm-Syck) Guzman 2003b:17.
  = Echinocereus acifer [published without basionym in Guzman et al. 2003a:78].
Echinocereus triglochidiatus var. arizonicus (Orcutt) Benson 1969a:21.
  = Echinocereus arizonicus.
Echinocereus triglochidiatus var. coccineus (Engelmann) Engelmann ex Marshall & Bock 1941:117.
Echinocereus triglochidiatus subsp. coccineus (Engelmann) Guzman 2003b:17.
  = Echinocereus coccineus. [published without basionym in Guzman et al. 2003a:78].
*Echinocereus triglochidiatus subsp. glochidiatus  Hunt et. al 2006:83{Typographical error]
  = Echinocereus triglochidiatus subsp. triglochidiatus
Echinocereus triglochidiatus var. gonacanthus (Engelmann & Bigelow) Boissevain 1940:36.
  = Echinocereus gonacanthus.
Echinocereus triglochidiatus var. gurneyi Benson 1969d:126.
  Type - locality: Texas, Brewster Co., igneous rocks south of Marathon; Correll & Benson 16,488 (POM).
    Nomenclatural synonyms:
      Echinocereus coccineus var. gurneyi (Benson) Heil & Brack1988:26.
      Echinocereus coccineus subsp. gurneyi * Blum 1997 Seed List nom. nud.
      Echinocereus coccineus subsp. gurneyi (L. Benson) D. Felix & H. Bauer 2014. - EcJ-Online 2 Sonderheft: XIII
        Note: This species is now believed to be a natural hybrid.
Echinocereus triglochidiatus var. hexaedrus (Engelmann & Bigelow) Boissevain 1940:36.
  = Echinocereus hexaedrus.
Echinocereus triglochidiatus var. huitcholensis (Weber) Guzman 2003b:17
  = Echinocereus huitcholensis [published without basionym in Guzman et al. 2003a:79].
Echinocereus triglochidiatus var. inermis Arp 1973:132-133
  = Echinocereus coccineus var. inermis.
Echinocereus triglochidiatus var. melanacanthus (Engelmann) Benson 1944:254.
  = Echinocereus coccineus var. melanacanthus.
    Note: This is the name used by Benson for Echinocereus coccineus.
Echinocereus triglochidiatus var. melanacanthus fa. inermis* Alabaster 1994:105 nom. inval.
  = Echinocereus coccineus var. inermis.
Echinocereus triglochidiatus var. mojavensis (Engelmann & Bigelow) Benson 1944:255.
  = Echinocereus mojavensis.
Echinocereus triglochidiatus subsp. mojavensis (Engelmann & Bigelow) Blum & Lange in Blum et al. 1998b:362.
  = Echinocereus mojavensis.
Echinocereus triglochidiatus var. mojavensis fa. inermis (Schumann) Ferguson 1989:219.
  = Echinocereus coccineus var. inermis.
Echinocereus triglochidiatus subsp. mojavensis fa. inermis (Schumann) Blum in Blum et al. 1998a:9. [see Blum et al. 1998b:365].
  = Echinocereus coccineus var. inermis.
Echinocereus triglochidiatus var. multicostatus (Cels ex Rumpler) Marshall 1953:67.
  = Echinocereus multicostatus Cels ex Rumpler 1886:834.
Echinocereus triglochidiatus var. neomexicanus (Standley) Standley ex Marshall & Bock 1941:118.
  = Echinocereus neomexicanus.
Echinocereus triglochidiatus var. neomexicanus fa. rosei* Blum 1990:12. pro syn.
  = Echinocereus rosei.
Echinocereus triglochidiatus var. octacanthus* Muhlenpfordt ex Marshall & Bock 1941:118 nom. invalid.
  = Echinocereus octacanthus.
Echinocereus triglochidiatus var. pacificus (Englemann ex Orcutt) Engelmann ex Marshall & Bock 1941:118.
  = Echinocereus pacificus.
Echinocereus triglochidiatus subsp. pacificus (Englemann ex Orcutt) Guzman 2003b:17.
  = Echinocereus pacificus [published without basionym in Guzman et al. 2003a:79.]
Echinocereus triglochidiatus var. paucispinus (Engelmann) Engelmann ex Marshall & Bock 1941:118.
  = Echinocereus paucispinus.
Echinocereus triglochidiatus var. polyacanthus (Engelmann) Benson 1944:253.
  = Echinocereus polyacanthus.
Echinocereus triglochidiatus subsp. polyacanthus (Engelmann) Guzman 2003b:17.
  = Echinocereus polyacanthus [published without basionym in Guzman et al. 2003a:79.]
Echinocereus triglochidiatus var. rosei (Wooten & Standley) Marshall 1950:63.
  = Echinocereus rosei.
Echinocereus triglochidiatus var. toroweapensis Fischer 1991:195.
  Type - locality: Arizona, Mohave Co.,Toroweap Point 1340 m.; P.C. Fischer 7196 (ARIZ).
    Nomenclatural synonyms:
      Echinocereus toroweapensis (Fischer) Fuersch 1993:266-268.
Echinocereus triglochititus* Engelm. ex Haage 1900:162. nom. nud.
  [probably an error in spelling for Echinocereus triglochidiatus].
Echinocereus trockyi* Frič 1918(8) [in advertisement] nom. nud.
Echinocereus tuberculatus* Hort. ex Haage 1900:162 nom. nud.
Echinocereus tuberosus* Poselger ex Rumpler 1886:783 nom. illegit.
  basionym: Cereus tuberosus Poselger 1853:135 non Pfeiffer.
  = Echinocereus poselgeri.
Echinocereus tulensis Bravo 1973:110-111.
  Type - locality: Mexico, Tamaulipas, 1 km. south of Tula Junction on highway between Huizache & Juamave;
    Sanchez-Mejorada 2085, 4 May 1973 (MEXU).
  Nomenclatural synonyms:
    Echinocereus cinerascens var. tulensis (Bravo) Taylor 1988:69.
    Echinocereus cinerascens subsp. tulensis (Bravo) Taylor 1997:8.
Echinocereus twaitesii* Hort. ex Haage 1892:119 nom. nud.
Echinocereus uehri Blanc 1888:40.
  Type - locality: unknown.
Echinocereus undulatus* Hildmann ex Schumann 1895:124 pro syn.
  = Echinocereus cinerascens.
Echinocereus uspenskii Blanc 1888:40.
  Type - locality: unknown; ? (?).
    Nomenclatural synonyms:
      Echinocereus enneacanthus fa. uspenskii* Parker 1996:2 nom. nud.
Echinocereus uspenskii* Haage 1900:162 nom. illegit. (later homonym).
Echinocereus utahensis* Kohres Cat 1984. nom. nud.
Echinocereus vatteri* Botzenhart Kakteen und andere Sukkulenten 1968 front cover nom. nud.
  = Echinocereus viereckii.
Echinocereus viereckii Werdermann 1934:188-189.
  Type - locality: Mexico, Tamaulipas, Mtns. between Juamave & Cd. Victoria, 1500-2000 m. ; ? (?).
Echinocereus viereckii subsp. huastecensis Blum, Lange & Rutow in Blum et al.1998:156-157.
  Type - locality: Mexico, Nuevo Leon, Rayones Canyon, 15 km west of  highway 85 on state road 6, 9 June 1986; Taylor 192 (K).
Echinocereus viereckii var. morricalii (Riha) Taylor 1985b:93.
  = Echinocereus morricalii.
Echinocereus viereckii subsp. morricalii (Riha) Taylor 1997:10.
  = Echinocereus morricalii.
Echinocereus viereckii subsp. santamariensis Blum & Felix 2010:65.
  Type - locality: Mexiko: Nuevo Leon: 5 km along road from Rayones to Galeana, 1000 m.; N.P. Taylor 194, 9 June 1986, [K].
Echinocereus virickii* White 1948:288 nom. nud.
Echinocereus viridiflorus Engelmann 1848a:91.
  Type - locality: New Mexico, Wolf Creek, Wislizenus 514, (MO 2016902).
    Nomenclatural synonyms:
      Cereus viridiflorus (Engelmann) Engelmann 1849:50.
      Echinocereus labouretii* Forster ex Rumpler 1886:811 pro syn.
Echinocereus viridiflorus var. canus Powell & Weedin 2004:273.
  Type - locality: Presidio Co., Solitario, S-facing crest of a novaculite ridge, c. 4847ft; A.M.Powell & S.A.Powell 6012 (SRSC).
    Nomenclatural synonym:
      Echinocereus canus (Powell & Weedin) Felix & Bauer in Blum et al. 2012:258 - 276.
Echinocereus viridiflorus var. centrispinus* Bailey 1941:271 nom. nud.
Echinocereus viridiflorus var. chloranthus (Engelmann) Backeberg 1960:2015.
  = Echinocereus chloranthus.
Echinocereus viridiflorus fa. chloranthus (Engelmann) Krainz 1967:51.
  = Echinocereus chloranthus.
Echinocereus viridiflorus subsp. chloranthus (Engelmann) Taylor 1997:10.
  = Echinocereus chloranthus.
Echinocereus viridiflorus var. chrysacanthus* Schelle1907:129 nom. nud.
Echinocereus viridiflorus var. correllii Benson 1969d:128.
  Type - locality: Texas, Brewster Co., above Ft. Pena Colorada, 4 mi. south of Marathon,4100 ft.; Benson & Correll 16485, 4 Apr.(POM317079).
    Nomenclatural synonyms:
      Echinocereus viridiflorus subsp. correllii (Benson) Blum & Lange in Blum et al. 1998b:198.
Echinocereus viridiflorus subsp. correllii (Benson) Blum & Lange in Blum et al. 1998b:198.
  =Echinocereus viridiflorus var. correllii.
Echinocereus viridiflorus var. cylindricus (Engelmann) Engelmann ex Rumpler 1886:812.
  basionym: Cereus viridiflorus var. cylindricus Engelmann 1856:278.
    Type - locality: Texas, Valley of Limpia Creek; Wright [418], 11 June 1851 (MO 2016904).
      Nomenclatural synonyms:
        Echinocereus chloranthus var. cylindricus (Engelmann) Taylor 1984:169.
        Echinocereus viridiflorus subsp. cylindricus (Engelmann) Taylor 1991:10.
        Echinocereus chloranthus subsp. cylindricus Blum & Lange in Blum et al. 1998b:205.
          Note: Echinocereus strausianus is usually considered a taxonomic synonym of this variety.
Echinocereus viridiflorus var. davisii (Houghton) Marshall & Bock 1941:119.
  = Echinocereus davisii.
Echinocereus viridiflorus fa. davisii (Houghton) Krainz 1967:51.
  = Echinocereus davisii.
Echinocereus viridiflorus subsp. davisii (Houghton) Taylor 1997:10.
  = Echinocereus davisii.
Echinocereus viridiflorus var. elongatus* Hort. ex Backeberg 1962:3847 nom. nud.
Echinocereus viridiflorus fa. faciliflorus* Hildmann ex Schelle 1907:129 nom. nud.
Echinocereus viridiflorus var. gracilispinus Hort. ex Rumpler 1886:814.
  Type - locality: unknown; ? (?).
Echinocereus viridiflorus var. intermedius* Backeberg 1960:2015 nom. inval. (no type designated).
  Note: This plant is said to be from Texas.
Echinocereus viridiflorus fa. longispinus* Schelle 1907:129 nom. nud.
Echinocereus viridiflorus var. major* Maas 1906:142 nom. nud.
Echinocereus viridiflorus var. minor* Engelmann ex Weniger 1970:14 nom. nud.
  basionym: Cereus viridiflorus var. minor* Engelmann 1856:278 which is a new name for Echinocereus viridiflorus var.
    viridiflorus.
Echinocereus viridiflorus var. montanus* Kunzler Catalog nom. nud.
Echinocereus viridiflorus var. neocapillus Leuck ex Zimmerman in Powell & Weedin 2004:267.
  = Echinocereus chloranthus var. neocapillus.
Echinocereus viridiflorus var. robustior* Kuenzler HK1007 Los Pinos, Valencia Co., NM
  Field number HK1007 Los Pinos, Valencia Co., NM
Echinocereus viridiflorus var. ruberrimus* Frič 1924:121 nom. nud.
Echinocereus viridiflorus var. rubrus* Frič 1924:121 nom. nud.
Echinocereus viridiflorus var. russanthus (Weniger) Zimmerman in Powell & Weedin 2004:263.
  = Echinocereus russanthus.
Echinocereus viridiflorus fa. sanguineus* Rgl. ex Schelle 1907:129 nom. nud. [perhaps the same as Echinocereus sanguineus].
Echinocereus viridiflorus var. standleyi (Britton & Rose) Orcutt ex Weniger 1969:37.
  = Echinocereus standleyi.
Echinocereus viridiflorus fa. standleyi*. Parker 1996:3 nom. nud.
  = Echinocereus standleyi.
Echinocereus viridiflorus var. tuberculosus* Orcutt 1926:4 nom. nud.
Echinocereus viridiflorus var. tubulosus* Heller 1900:8 nom. illegit.
  basionym: Cereus viridiflorus var. tubulosus* Coulter 1896:383.
    Note: new name for Echinocereus viridiforus var. cylindricus.
Echinocereus viridiflorus var. weedinii* Leuck 1980:37-39 nom. inval.
Echinocereus viridiflorus var. weedinii ( Leuck ex W.Blum & Mich.Lange ) A.D. Zimmerman 2004: 270.
  = Echinocereus russanthus subsp. weedinii.
Echinocereus waldeisii Haugg 1994:6.
  Type - locality: Mexico, San Luis Potosi, west of Tula, Huizache; D. Waldeis, 1988 (WU).
    Nomenclatural synonyms:
      Echinocereus tamaulipensis subsp. waldeisii (Haugg) Lange 1995:142.
      Echinocereus poselgeri var. waldeisii* Parker 1996:6 nom. nud.
Echinocereus webeserii* Pavey 1979: n.p. nom. nud.
  [Apparently a form of Echinocereus baileyi].
Echinocereus websterianus Lindsay 1947:153.
  Type - locality: Mexico, Gulf of California, San Pedro Nolasco Is.; Lindsay & Bool 498, 25 Feb. 1947 (DS314191).
Echinocereus weinbergii Weingart 1912:83.
  Type - locality: North America [This plant has been relocated near Sombrerete, Zacatecas, Mexico]; ? (?).
    Nomenclatural synonyms:
      Echinocereus pulchellus var. weinbergii (Weingart) Taylor 1985a:272.
      Echinocereus pulchellus subsp. weinbergii B(Weingart) Taylor 1997:9.
      Echinocereus weinbergii var. albispinus* Hort. ex Schelle 1926:175 nom. nud.
*Echinocereus whipplei var. heilii Spelling error for Echinocactus whipplei.
Echinocereus winterianus* Kunzmann 1985:79. nom. nud.
Echinocereus yavapaiensis Baker 2006:63.
  Type - locality: 7 km NNe of Crown King, Yavapai County, Arizona, Baker & Lisenby (ASU).
Echinocereus zuniensis* Eng. & Big. ex Haage & Schmidt 1918 nom. nud. In advertisement opposite p. 74 Monatsschrift für
  Kakteenkunde. 28(7). = Echinocereus mojavensis var. zuniensis.