Echinocereus bonkerae J. J. THORNBER & F. BONKER subsp. apachensis (W. BLUM & J. RUTOW) A. ZIMMERMAN Baker et al.: – Chromosome numbers of some cacti of the Western North America. – Haseltonia 15 (VII): 120 (2009) Holotypus USA, Arizona, Maricopa County, Apache Trail, near Fish Creek, Mc Kelvey 735, 18. February 1929 [US 1532949] Synonyme Echinocereus apachensis Echinocereus boyce-thompsonii Etymologie Echinocereus = Igelsäulenkaktus apachensis = benannt nach Vorkommen am Apache Trail Originaltext der Umkombination (2009) im Auszug The diploid chromosome number indicates that the well-known Fish Creek phenotype of Echinocereus is not part of the widespread tetraploid E. engelmannii. Echinocereus bonkerae ssp apachensis differs from typical E. bonkerae in spininess (mostly its spectacularly greater central spine length). Intermediate spine forms (highly variable) are seen in the Sierra Ancha (including one of the chromosome vouchers cited herein), the Mazatzal Mountains, and in the mountains between Globe and Superior. Subspecies apachensis is relatively xeromorphic (tall, seriously spiny plants at the lower altitudinal limits of the species). Nominate subspecies bonkerae grows as compact clumps of shorter stems …