|Jepson Flora Project: Jepson Interchange|
|TREATMENT FROM THE JEPSON MANUAL (1993)||
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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
AND IS MAINTAINED FOR ARCHIVAL PURPOSES ONLY
Annual to tree
Leaves basal or cauline, alternate to whorled, simple to compound
Inflorescence: 1° inflorescence a head, each resembling a flower, 1many, generally arrayed in cymes, generally subtended by ± calyx-like involucre; flowers 1many 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)45; stamens 45, 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):128. See glossary p. 25 for illustrations of general family characteristics.
Annual to subshrubs, generally ± hairy
Leaves alternate or basal, generally petioled, reduced upward, entire and linear or generally elliptic to ovate or obovate and 14-pinnately lobed; 1° lobes longest near middle or base of blade
Inflorescence: heads discoid (but outer flowers often enlarged, ± ray-like), 1many per stem, generally in terminal cymes; peduncle generally hairy like phyllary bases; involucre generally < 15 mm diam, cylindric to obconic or hemispheric; phyllaries in 12 ± equal series, generally linear to lanceolate, tips generally ± flat, generally ± green; receptacle flat to rounded, generally naked
Flowers 10many; corollas radial (outer, if enlarged, ± bilateral), generally white to pinkish or yellow, generally opening in daytime; anthers generally exserted
Fruit club-shaped, generally not compressed, stiffly hairy; pappus 0 or of 420 fringed scales in 1few series
Species in genus: 18 species: w North America
Etymology: (Greek: gaping ray, from enlarged outer corollas of some)
Reference: [Mooring 1980 Amer J Bot 67:13041309]
Spp. of sect. Chaenactis hybridize.
Annual, branched below middle, sometimes ± scapose
Stems 1many, ± erect, < 40 cm, becoming glabrous before flower time except near heads
Leaves < 9 cm, generally glabrous, ± fleshy; basal rosette withering; largest blades entire or 1-pinnately lobed, lobes 12(5) pairs, well separated, longest near middle, tips cylindric
Inflorescence: heads 1few per stem; peduncles < 11 cm, generally glandular-hairy near heads; involucre obconic to hemispheric, ± truncate at base, becoming glabrous; longest phyllaries 810(12) mm, tips erect, rigid, sharp
Flowers: corollas white to pinkish, outer bilateral, greatly enlarged, inner radial, 57 mm
Fruit (3)68 mm; pappus scales in 1 series, smaller and unequal on outer fruit, on inner fruit 4(5), equal, longest generally 68.5 mm, > buds, tips visible
Ecology: Open sand or gravel
Elevation: < 1600 m.
Bioregional distribution: Tehachapi Mountain Area, s San Joaquin Valley, Inner South Coast Ranges, more common in s East of Sierra Nevada, Desert
Distribution outside California: to sw Utah, w Arizona, n Baja California
Flowering time: Spring
Horticultural information: TRY.