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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.



Meredith A. Lane

Species in genus: 1 sp
Etymology: (Greek: double pappus)
Reference: [Porter 1943 Amer J Bot 30:481–483]


A. fremontii Torr. & A. Gray

Shrub, glabrous
Stems much-branched, widely spreading to ascending, generally < 6 dm, striate, smooth, white above, grayish below; leafless stems spiny
Leaves short-petioled, generally < 2 cm, obovate or elliptic, entire, sometimes ± thick, light yellow- or gray-green
Inflorescence: heads radiate, in crowded, flat-topped clusters generally 3–5 cm wide; involucres cylindric, ± 5 mm, < 3 mm wide; phyllaries 7–12, ovate, whitish or pale green
Ray flowers 1–2, barely > involucre, tips 2- or 3-toothed, yellow
Disk flowers 3–7, staminate; corollas narrowly funnel-shaped, sinuses deep, lobes reflexed, style-branch appendages lanceolate to rounded
Fruit of ray flowers < or = 3 mm, hairy; pappus of 15–20 stout bristles fused at base, generally 1 mm; ovary of disk flowers < or = 1 mm, glabrous; pappus of 25 flattened, twisted bristles generally < or = 3 mm
Chromosomes: 2n=18
Ecology: Rocky or gravelly flats, slopes, canyons
Elevation: < 1600 m.
Bioregional distribution: c&e Mojave Desert
Distribution outside California: to Utah, Nevada, Arizona
Varieties not known to intergrade.

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