|University of California, Berkeley|
|Jepson eFlora: Taxon page
Key to families | Table of families and genera
Index to accepted names and synonyms:
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|Family: Cactaceae||View Description||Dichotomous Key|
|Genus:||View Description||Dichotomous Key|
|Species:||View Description||Dichotomous Key|
Habit: 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.
Species In Genus: 14 species: North America, Mexico. Etymology: (Hermann August Jacques Gruson, German engineer, industrialist, 1821--1895) Note: Hybridization unknown.
eFlora Treatment Author: Marc Baker, Bruce D. Parfitt & Jon Rebman
Jepson Online Interchange
Key to GrusoniaPrevious taxon: Ferocactus viridescens
Next taxon: Grusonia parishii
Citation for this treatment: Marc Baker, Bruce D. Parfitt & Jon Rebman 2017. Grusonia, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=82499, accessed on February 20, 2017.
Citation for the whole project: Jepson Flora Project (eds.) 2017. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on February 20, 2017.