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

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.

VENIDIUM

Elizabeth McClintock

Annual, perennial herb, tomentose
Stems erect, branched from base
Leaves alternate
Inflorescence: heads radiate, solitary; peduncles long; phyllaries in several overlapping series; receptacle flat, pitted, generally naked
Ray flowers: ligules generally yellow
Disk flowers many; corollas yellow; anthers with ovate tips, weakly sagittate at base; style slender below, thickened above a swollen node, branches short
Fruit 3–4-winged or -ribbed, glabrous; pappus 0 or of minute scales
Species in genus: 20–30 species: s Africa
Etymology: (Latin: vein, from the ribs)
Reference: [Stapf 1928 Curtis's Bot Mag Tab 9127]

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