Thelocactus
Thelocactus in Bull. Torrey Bot. Club 49: 251. 1922 sec. Hunt 2016
- ≡Echinocactus subg. Thelocactus, Gesamtbeschr. Kakt.: 429. 1897–1899 syn. sec. Hernández-Ledesma & al. 2015
- =Hamatocactus, Cactaceae 3: 104. 1922 syn. sec. POWO 2017+
- Type: Hamatocactus setispinus
- =Torreycactus in Sukkulenty 1: 19. 1998 syn. sec. Hunt 2006
- Type: Torreycactus conothele
Notes
See under Ferocactus.A
Description
Shrubs or unbranched plants; stems globose, depressed-globose or subcylindrical, tubercles rounded to conical, sometimes proximally confluent in spiral ribs; areoles on the apices of the tubercles, sometimes with a short adaxial groove that does not extend to the axile of mature tubercles; spines acicular or subulate, smooth or annulated, straight or curved, central and radial spines generally distinguishable, white, yellowish or red; flowers apical, funnel-shaped, pericarpal and receptacular tube scaly, scales more than 3, tepals white, yellow or magenta; fruits ovoid to globose-cylindric, greenish to reddish, semi-fleshy, scaly with the perianth rem-nants persistent, opening at maturity by a basal pore; seeds pyriform, with a basal hilum, black, testa papillate or smooth.B
Bibliography
A. Hernández-Ledesma, P., Berendsohn, W. G., Borsch, T., von Mering, S., Akhani, H., Arias, S., Castañeda-Noa, I., Eggli, U., Eriksson, R., Flores-Olvera, H., Fuentes-Bazán, S., Kadereit, G., Klak, C., Korotkova, N., Nyffeler, R., Ocampo, G. & Ochoterena, H. 2015: A taxonomic backbone for the global synthesis of species diversity in the angiosperm order Caryophyllales. – Willdenowia 45(3): 281-383