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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 leaning, branches 0, occasionally branched from tip-injury. Stem: (0)10–200(300) cm, 10–35 cm diam, depressed-spheric to short-columnar, hard, glabrous, not segmented; ribs 13–31, prominent; tubercles not conspicuous on ribs. Spines: 10–32 per areole, 2–4.5 mm wide, generally awl-shaped, generally flat, ringed with conspicuous ridges, straight to curved or ± hooked, some bristle-like; central spines generally 4 per areole. Flower: ± terminal, near distal edge of spine cluster, 3–6 cm diam; perianth yellow to red [or purple, or white with ± purple midstripes]; ovary glabrous, spines 0, scales numerous, generally rounded, margins minutely fringed or toothed. Fruit: spheric, ovoid, or cylindric, glabrous, spineless, dehiscent by basal pore. Seed: 1.5–3 mm, spheric to subreniform, pitted, black.
25 species: southwestern United States, Mexico. (Latin: fierce cactus) [Taylor 1984 Bradleya 2:19–38]
1. Perianth generally maroon outside, generally yellow within; stem generally > 0.4 m, 25–50 cm diam; ribs (18)21–31; inland ..... F. cylindraceus
1' Perianth ± all green-yellow; stem generally < 0.2 m, 10–25 cm diam; ribs 13–21; coastal ..... F. viridescens
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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