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.


Perennial, glabrous to densely hairy
Stems erect
Leaves simple, basal and cauline, alternate; lower wing-petioled; upper sessile; blade 3-veined
Inflorescence: heads large, radiate, 2–15 in ± flat-topped cymes; peduncles short to long; involucre disk-like or widely bell-shaped; phyllaries in 2 series; receptacle ovoid to spheric, naked
Ray flowers 14–35; ligules yellow to orange, elongated, 3–4-lobed
Disk flowers many; corollas yellow; tips of style branches truncate, shrub-like
Fruit oblong, 4-angled; hairs straight; pappus of 5–7 lanceolate scales
Species in genus: 3 species: w US to C.Am
Recent taxonomic note: *For revised taxonomy see Bierner 1994 Sida 16:1–8.
Etymology: (Dugald Stewart, Scotland, 1753–1828)
Reference: [Bierner 1974 Brittonia 26:385–392]

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