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Key to families | Table of families and genera
Indexes to all accepted names and synonyms:
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Perennial herb, shrub, tree, generally fleshy. Stem: cylindric to spheric, or flat; surface smooth, tubercled, or ribbed (grooved); nodal areoles bearing flowers. Leaf: generally 0 or early-deciduous, flat to ± cylindric. Spines: areoles generally with central, radial spines, occasionally with glochids. Flower: generally 1 per areole, bisexual [unisexual], sessile, radial [bilateral]; perianth parts generally many , scale-like to petal-like; stamens many; ovary inferior [superior], style 1, stigma lobes generally several [many]. Fruit: dry to fleshy or juicy, indehiscent to variously dehiscent, spiny, scaly, or naked; tubercled or smooth. Seed: generally many, occasionally 0–few.
± 125 genera, ± 1800 species: America (especially deserts), Africa; many cultivated, some edible. [Parfitt & Gibson 2004 FNANM 4:92–257] Spines smaller, fewer (0) in shade forms; yellow spines blacken in age. Introduced species increasingly escape cultivation. Hybridization common in some genera. Taxa of Escobaria in TJM (1993) moved to Coryphantha. —Scientific Editors: Bruce D. Parfitt, Douglas H. Goldman, Bruce G. Baldwin.
Unabridged references: [Hunt 2006 The New Cactus Lexicon, DH Books, Milborne Port, England]
Key to Cactaceae
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.Key to Sclerocactus
± 25 species: southwestern United States, Mexico. (Greek: hard or cruel cactus)
Previous taxon: Opuntia X vaseyi
Next taxon: Sclerocactus johnsonii
Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Dec 18 2014
Citation for this treatment: [Author of taxon treatment] 2013. Sclerocactus, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=9221, accessed on Dec 18 2014
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