Jepson Flora Project: Jepson Interchange    

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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California

  • Up-to-date information about California vascular plants is available from the Jepson eFlora.



David J. Keil, Family Editor and author, except as specified

Annual to tree
Leaves basal or cauline, alternate to whorled, simple to compound
Inflorescence: 1° inflorescence a head, each resembling a flower, 1–many, generally arrayed in cymes, generally subtended by ± calyx-like involucre; flowers 1–many per head
Flowers bisexual, unisexual, or sterile, ± small, of several types; calyx 0 or modified into pappus of bristles, scales, or awns, which is generally persistent in fruit; corolla radial or bilateral (rarely 0), lobes generally (0)4–5; stamens 4–5, anthers generally fused into cylinder around style, often appendaged at tips, bases, or both, filaments generally free, generally attached to corolla near throat; pistil 1, ovary inferior, 1-chambered, 1-seeded, style 1, branches 2, generally hair-tufted at tip, stigmas 2, generally on inside of style branches
Fruit: achene, cylindric to ovoid, generally deciduous with pappus attached
Genera in family: ± 1300 genera, 21,000 species (largest family of dicots): worldwide. Largest family in CA. Also see tribal key to CA genera: Strother 1997 Madroño 44(1):1–28. See glossary p. 25 for illustrations of general family characteristics.



G. Ledyard Stebbins

Species in genus: 1 sp.: sw US, n Mex
Etymology: (Greek: unequal pappus)


A. acaulis Torr. & A. Gray

Annual; sap milky
Leaves all basal, 3–5 cm, pinnately lobed; lobes toothed, ± hairy
Inflorescence: head ligulate, solitary, 2–3 cm; peduncle 5–20 cm, glabrous; phyllaries papery-transparent on margins, often with reddish tips and dots, in several series, outer short, oblong, blunt, inner linear, pointed; receptacle with long, narrow chaff scales
Flowers many; ligules pale yellow, readily withering
Fruit 10–15-veined; pappus of plumose bristles in 1 series, white, those on inner side of achene < on outer
Chromosomes: 2n=18
Ecology: Sandy washes, dry slopes
Elevation: 600–2400 m.
Bioregional distribution: s Sierra Nevada, Tehachapi Mountain Area, San Joaquin Valley, South Coast Ranges, Transverse Ranges, Peninsular Ranges, Great Basin Floristic Province, Desert
Distribution outside California: Nevada, Arizona, Baja California
Flowering time: Apr–Jun
Horticultural information: TRY.

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