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|Jepson eFlora: Taxon page
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|Family: Asteraceae (Compositae)||View Description||Dichotomous Key|
|Genus: Pleiacanthus||View Description||Dichotomous Key|
|Species:||View Description||Dichotomous Key|
Pleiacanthus spinosus (Nutt.) Rydb.
Habit: Subshrub 1--5 dm, from woody caudex; sap milky. Stem: 1--4+, woolly-hairy in axils of bud scales at and just below ground level, otherwise glabrous; branches rigidly spreading, thorn-tipped. Leaf: cauline; proximal linear, entire, distal bract-like. Inflorescence: heads liguliflorous, 1; peduncle 1--4 mm; involucre 7--12 mm; phyllaries in 2 series, outer 4--6, unequal, < 1/2 × inner, inner 3--5, equal, lance-linear; receptacle flat or convex, smooth, epaleate. Flower: 3--5; ligules pink or lavender to red-purple (white). Fruit: 6--8 mm; cylindric, faces 5, each with a long, narrow, shallow groove; pappus persistent, of 50+ free, minutely barbed, light tan bristles of 2 lengths. Chromosomes: 2n=16.
Ecology: Gravelly washes, slopes, sagebrush scrub, pinyon/juniper woodland; Elevation: 425--2900 m. Bioregional Distribution: SNH, SnGb, SnBr, GB, DMtns; Distribution Outside California: to Oregon, Montana, Utah, Arizona. Flowering Time: Jun--Sep
Synonyms: Stephanomeria spinosa (Nutt.) Tomb
eFlora Treatment Author: L.D. Gottlieb
Jepson Online Interchange
Previous taxon: Pleiacanthus
Next taxon: Pleurocoronis
Citation for this treatment: L.D. Gottlieb 2016. Pleiacanthus spinosus, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=80336, accessed on February 10, 2016.
Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on February 10, 2016.