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FNA | Family List | FNA Vol. 4 | Cactaceae | Ferocactus

5. Ferocactus hamatacanthus (Muehlenpfordt) Britton & Rose, Cact. 3: 144. 1922.

Texas barrel cactus

Echinocactus hamatacanthus Muehlenpfordt, Allg. Gartenzeitung 14: 371. 1846 (as hamatocanthus)

Stems erect, spheric to short cylindric, 10-63 × 7.5-30 cm; ribs 10-17, crenate or sharply notched to undulate or deeply sinuate, hence ribs prominent to poorly defined, or stem sometimes tuberculate. Spines 12-16(-28) per areole, pinkish brown and/or straw colored, often imparting appearance of dried grass clump, smallest spines per areole slender, sometimes bristlelike, less than 1 mm diam.; central spines 4(-8) per areole, terete to strongly flattened, apically curved or strongly hooked, very flexible, sometimes almost papery, smooth to weakly annulate, principal central spine (40-)60-165 × (0.5-)1-3 mm. Flowers yellow inside and out, 5.5-8(-10) × 6.5-9.5 cm; inner tepals bright lemon yellow, very glossy; stigma lobes pale yellow. Fruits indehiscent, green or maroon, 20-50 × 10-30 mm, thin walled, soft, juicy, locule filled with very juicy pulp and seeds. Seeds 1-1.6 mm, pitted.

Varieties 2 (2 in the flora): sw United States, n Mexico.

1 Principal central spine angled or terete, hard, narrow, mostly 1-1.5 mm wide; stigma lobes 11-14; seeds 1.4-1.6 mm; mostly west of Pecos River in Chihuahuan desert scrub   5a var. hamatacant
+ Principal central spine flattened, sometimes almost papery, broad, 1.3-3 mm wide; stigma lobes 8-10; seeds 1 mm; mostly east of Pecos River in Tamaulipan thorn scrub   5b var. sinuatus


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