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

SUNFLOWER FAMILY

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.

RHAGADIOLUS

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)

Introduced

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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bioregional map for RHAGADIOLUS%20stellatus being generated
 
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Retrieve Jepson Interchange Index to Plant Names entry for Rhagadiolus stellatus
Retrieve dichotomous key for Rhagadiolus
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