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

Annual; sap milky
Stem solitary, branched
Leaves basal and cauline, alternate, simple, toothed or pinnately lobed
Inflorescence: heads ligulate, few–many; phyllaries in 2 rows, outer short, inner fused at base, spreading in fruit; receptacle ± flat, naked
Flowers many; ligules yellow, readily withering
Fruit cylindric, of 2 kinds; outer enclosed by inner phyllaries, long-persistent; inner deciduous; pappus 0
Species in genus: 7 species: Eur, w Asia
Etymology: (Latin: crevice-like, from strongly folded inner phyllaries)


R. stellatus (L.) Gaertn.

Plants sparsely hairy throughout
Stems 0.7–4 dm
Leaves 2.5–14 cm, oblong to obovate, sparsely toothed or lobed
Inflorescence: heads 5–8 mm in flower; outer phyllaries 5; inner phyllaries 5–8
Fruit: outer fruits 10–15 mm, curved, spreading with attached phyllaries to form star-shaped structure
Chromosomes: 2n=10
Ecology: Uncommon. Weed of disturbed places
Elevation: < 200 m.
Bioregional distribution: s Outer North Coast Ranges (Napa Co.), San Francisco Bay Area
Distribution outside California: native to Europe
Synonyms: R. edulis Willd. misapplied

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