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CACTACEAE CACTUS FAMILY

Bruce D. Parfitt, except as noted

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 [5], 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

SCLEROCACTUS PINEAPPLE CACTUS

J. Mark Porter & Edward F. Anderson

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: [2]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)

Key to Sclerocactus

S. johnsonii (Engelm.) N.P. Taylor JOHNSON'S BEE-HIVE CACTUS
NATIVE
Stem: 10–25 cm, ovoid to cylindric; ribs 17–21. Spines: yellow or pink to ± red; central spines 3–4 cm; radial 9–10 per areole. Flower: ± green-yellow, or pink to magenta. Fruit: 7–15 mm, 3–5 mm diam; scales widely cordate, ciliate.
2n=22. Granitic slopes and plains, creosote-bush scrub; 500–1200 m. n Mojave Desert (Inyo Co.); to southwestern Utah, northwestern Arizona. [Echinomastus johnsonii (Engelm.) E.M. Baxter] Apr–May [Online Interchange] {CNPS list}
Unabridged synonyms: [Echinocactus johnsonii Parry ex Engelm.; Echinomastus johnsonii (Parry ex Engelm.) E.M. Baxter; Neolloydia johnsonii (Parry ex Engelm.) L.D. Benson]
Unabridged note: Expanded author citation: Sclerocactus johnsonii (Parry ex Engelm.) N.P. Taylor

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Apr 23 2014
Citation for this treatment: [Author of taxon treatment] 2012. Sclerocactus, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=43803, accessed on Apr 23 2014

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click for enlargement Sclerocactus johnsonii
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© 2010 Neal Kramer

Bioregions in which Sclerocactus johnsonii occurs Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.