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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.
Subshrub, appearing glabrous. Stem: decumbent to erect, striate; old stems gray, bark sometimes shreddy with age; young stem proximally white, distally green. Leaf: simple, proximally sometimes in axillary clusters, spreading-ascending to appressed-erect, linear to oblong or narrowly oblanceolate, generally minutely stiff-pointed, pale green to light gray-green. Inflorescence: heads radiate or discoid, 1 or in rounded to ± flat-topped clusters, small in bud, expanding rapidly in fruit; involucre widely bell-shaped to ± spheric; phyllaries 20–24, graduated in 2–3 series, ovate to ovate-elliptic, bases cream-yellow, tips green, margins scarious; receptacle deeply pitted, with projections between flowers, epaleate. Ray flower: present or 0; corolla yellow. Disk flower: 14–80; corolla funnel-shaped, yellow, sinuses deep, lobes spreading to reflexed; anther tip acute; style tips lanceolate. Fruit: densely long-hairy, hairs white, bronze, or ± brown; pappus of 20–25 wide, stiff, wide-spreading bristle-like scales, slightly > fruit.
2 species: southwestern United States. (Greek: unbending pappus) [Nesom 2006 FNANM 20:184–185]
Unabridged references: [Lane 1988 Madroño 35:247–265]
1. Heads radiate, generally solitary; involucre bell-shaped to hemispheric, 7–10 mm diam ..... A. shockleyi
1' Heads discoid, generally in rounded to flat-topped clusters; involucre hemispheric to spheric, 8–16 mm diam ..... A. sphaerocephalus
2. Leaf faces densely rough-puberulent ..... var. hirtellus
2' Leaf faces glabrous (margins sometimes sparsely rough-puberulent) ..... var. sphaerocephalus
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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