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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.

 

GRUSONIA CLUB-CHOLLA

Marc Baker, Bruce D. Parfitt & Jon Rebman


Perennial herb or shrub, erect to decumbent, many-branched, matted, succulent. Stem: winter- or drought-deciduous, regularly segmented, segments < 30 cm, < 6 cm diam, cylindric to club-shaped, fleshy, glabrous; ribs 0, tubercles generally elongate, occasionally 0. Leaf: deciduous. Spines: 0–many per areole, densest and longest near stem tip, < 4 mm wide, awl- to dagger-shaped, flat to angular, straight, roughened, tip smooth or barbed, epidermis at spine tip separating as a papery sheath; glochids generally numerous in each areole. Flower: lateral to terminal on stem, from upper portion of areole, 30–50 mm diam; perianth yellow or pink; ovary glabrous, spines 0–many, glochids many in each areole, scales 0. Fruit: indehiscent, obconic, base generally long-tapering, glabrous to densely spiny, glochids many in each areole. Seed: 3–6 mm, ± round, encased in an aril; bony, ± white when dry.
14 species: North America, Mexico. (H.A.J. Gruson, German engineer, industrialist, 1821–1895) Hybridization unknown.
Unabridged etymology: (Hermann August Jacques Gruson, German engineer, industrialist, 1821–1895)

Key to Grusonia

1. Perianth yellow; largest spine with cross-rows of rough papillae except at tip; ovary glochids stiff, reflexed-barbed ..... G. parishii

1' Perianth pink-magenta; largest spine smooth; ovary glochids hair-like, ascending-barbed ..... G. pulchella

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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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