Ferocactus wislizeni

Stems usually leaning southward in adulthood, depressed-spheric to ovoid-cylindric, 19–100(–300) × (20–)36–65(–100) cm. Ribs 20–30(–40), shallowly notched immediately above each areole. Spines 16–25(–29) per areole, central spines and larger radial spines dull pink, gray, or tan; smallest spines per areole white, slender, often bristlelike, less than 1 mm diam., strongly contrasting with central spines; central spines (1–)2–4, often with several, subulate subcentral spines, rigid; principal central spine strongly hooked (very rarely straight), 36–120(–150) mm from curve of hook to base of spine, 1.5–4(–7) mm wide, strongly annulate, terete, ± angular, or flattened and often adaxially troughlike; other central spines subulate, slightly smaller. Flowers similar in color inside and out, 4–8.5 × 4–6.5 cm; inner tepals orange, red, or yellow with orange to red midstripes, or wholly yellow; stigma lobes yellow, orange, or red. Fruits ± readily dehiscent through basal pore, bright yellow, 35–60 × 18–40 mm, thick walled, leathery or fleshy, locule dry, hollow except for seeds. Seeds (1.9–)2–2.5(–2.9) mm, essentially smooth with very narrow and slightly raised reticulations. 2n = 22.

Water moderately, allowing the top 3cm to dry out between watering.

Ferocactus Wislizeni

Ferocactus wislizeni

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