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Key to families | Table of families and genera
Specimen numbers are hyperlinked to records in the Consortium of California Herbaria data view where possible. Taxa are hyperlinked to entries in the Jepson Interchange via the "[Online Interchange]" link.
Erect or ascending, branches generally 0. Stem: 5–20 cm, 2–12 cm diam, ovoid to cylindric, not segmented, firm; ribs 8–21, prominent; tubercles distinct along ribs. Spines: 10–24 per areole, 0.3–2.1 mm diam, needle-like or awl-shaped, straight to curved or hooked; central spines 1–11 per areole. Flower: ± terminal, from upper edge of spine cluster, 25–75 mm diam; perianth ± green-yellow to magenta; ovary glabrous, spineless, scales sparse, rounded, ciliate at least near tip. Fruit: dehiscent by 2–4 short longitudinal slits, cylindric to ± spheric, spines 0. Seed: 2–3.7 mm, reniform, tubercled, glossy or shiny, black.
± 25 species: southwestern United States, Mexico. (Greek: hard or cruel cactus)
1. Central spines 4–8 per areole, all ± alike, robust, 1–1.5 mm wide at base, straight to curved but not hooked ..... S. johnsonii
1' Central spines 9–11 per areole, of 2 kinds, hooked spines 5–8 per areole, slender and flexible, 0.3–0.7 mm wide at base, distal-most spines 1–3 per areole, upright, straight, flat, ± white, 1–2.1 mm wide at base ..... S. polyancistrus
Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html [accessed on month, day, year]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].
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