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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.
Generally erect, not branched, or if branched then forming low ± 50 cm diam clumps with up to 12 branches. Stem: not segmented; 2–15 cm, 2–15 cm diam, spheric, ovoid, or cylindric, soft-fleshy to firm, ribs 0, tubercles conic to cylindric, grooved along distal surface from base (axil) to spine cluster at tip. Spines: 3–95 per areole, < 1 mm diam, needle-like, smooth, straight [curved or hooked]; central spines 3–12. Flower: ± at stem tip, in axil of tubercle; 6–37 mm diam; perianth ± yellow-green to rose-pink or ± purple; ovary glabrous, spines 0, scales generally 0–few, fringed [entire]. Fruit: indehiscent, wide-ellipsoid to narrowly obovoid, spineless. Seed: 1.3–2.3 mm, reniform, pitted, black or brown.
16 species: western United States, Mexico. (Greek: crown + flower, referring to top flower position) [Taylor 1986 Cact Succ J Gr Brit 4:36–44]
1. Stigma lobes widely spreading — inner perianth pale to deep rose-pink or rose-violet, midstripe conspicuously darker ..... C. alversonii
1' Stigma lobes erect to ascending
2. Inner perianth ascending or recurved only at tips, ± yellow-green to pale cream-yellow or pale orange, darker midstripe generally well defined ..... C. chlorantha
2' Inner perianth generally spreading, recurved, pale to dark rose-pink to magenta, lacking a well defined midstripe ..... C. vivipara var. rosea
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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