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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.
Shrub, generally < 6 dm, glabrous or herbage minutely stiff-hairy. Stem: much-branched, widely spreading to ascending, striate, smooth, white distally, ± gray proximally; leafless stems thorny. Leaf: alternate, short-petioled, generally < 2 cm, obovate or elliptic, entire, sometimes ± thick, light yellow- or gray-green. Inflorescence: heads radiate, in groups of 2–4, crowded in flat-topped cyme-like clusters generally 3–5 cm wide; involucres obconic-cylindric, ± 5 mm, < 3 mm wide; phyllaries 7–12, ovate, ± white or pale green; receptacle flat, pitted, epaleate. Ray flower: 1–2; ray barely exceeding involucre, 2- or 3-toothed, yellow. Disk flower: 3–7, staminate; corolla narrowly funnel-shaped, sinuses deep, lobes reflexed, style-branch appendages lanceolate to rounded. Fruit: ray fruit <= 3 mm, hairy; pappus of 15–20 stout bristles fused at base, generally 1 mm; ovary of disk flower <= 1 mm, glabrous; pappus of 25 flattened, twisted bristle-like scales generally <= 3 mm. Varieties not known to intergrade. Phylogenetic studies by Roberts & Urbatsch 2004 Syst Bot 29:199–215, suggest that Amphipappus and some other small genera should be merged into Chrysothamnus. [Online Interchange]
1. Leaves glabrous, sometimes gummy ..... var. fremontii
1' Leaves minutely scabrous on faces and margins ..... var. spinosus
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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