Sclerocactus polyancistrus

Sclerocactus polyancistrus (redspined fishhook cactus) is a series of Sclerocactus. It's type locality is at the head of the Mojave River, California.

Background
Simple, globular to oblong, 1 to 4 dm. high; ribs 13 to 17, 1 to 1.5 cm. high, obtuse, strongly undulate; areoles 1 to 1.5 cm. apart; spines about 20; radial spines acicular, white, 1 to 2.5 cm. long; central spines several, rather unequal, up to 12.5 cm. long, the upper ones erect, white, flattened, the others brown, spreading, terete and often hooked; flowers magenta-colored, nearly 8 cm. long, and perhaps as broad; inner perianth-segments oblong, about 4 cm. long; throat of flower broad, covered with stamens; tube-proper very short, 1 to 2 mm. long; style longer than the stamens, stout, glabrous; stigma-lobes about 8, 4 mm. long; scales on the base of the flower-tube large, obtuse, on the ovary scattered, minute, 1 to 2mm. long; fruit at first bright magenta, with fleshy walls, but becoming dry and thin-walled, oblong to pyriform, almost destitute of scales, 3.5 to 4 cm. long, dehiscing by a large basal pore; seeds large, 4 mm. long, black, tuberculate; hilum sublateral, large. Distributed in the Deserts of California and Nevada; reported from western Arizona.