|University of California, Berkeley|
Key to families | Table of families and genera
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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