Jepson Flora Project: Jepson Interchange    

 
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Jepson Interchange (more information)
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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.

GAZANIA

Elizabeth McClintock

Perennial from stolons or rhizomes; juice milky
Leaves all basal, ± entire to dentate
Inflorescence: heads radiate, large, showy, solitary, scapose; peduncles long; phyllaries in 2 or more series, fused in basal half; receptacle flat or convex, pitted, naked
Ray flowers yellow or orange, variously marked, sterile, closing at night
Disk flowers many; corollas variously colored; stamen tips ovate-triangular, bases minutely sagittate; style slender below, thickened above a minutely hairy node, branches very short
Fruit obovate, covered with long hairs; pappus of slender scales ± hidden by hairs of achene
Species in genus: ± 16 species: especially s Africa
Etymology: (Theodorus of Gaza, died 1478, translator of works of Theophrastus)
Reference: [Hutchinson 1934 Curtis's Bot Mag Tab 9354]

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