TREATMENT FROM THE JEPSON MANUAL (1993) |
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©Copyright 1993 by the Regents of the University of California
For up-to-date information about California vascular plants, visit the Jepson eFlora. |
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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.
Native |
Annual, branched above middle
Stems 1several, erect, < 50 cm; base generally becoming glabrous before flower time
Leaves < 7 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 fewmany per stem; peduncles < 6 cm; involucre widely obconic, base (at least of outer phyllaries) glabrous, tips densely puberulent, glandless; longest phyllaries 1018 mm, generally recurved, tips soft, blunt
Flowers: corollas white to pinkish, all radial, 79 mm, outer somewhat enlarged
Fruit 59 mm; pappus scales 8 in 2 series, outer << inner, longest 59 mm
Chromosomes: 2n=14
Ecology: Sand
Elevation: 3002500 m.
Bioregional distribution: s Sierra Nevada, South Coast Ranges, Transverse Ranges, Great Basin Floristic Province, w Mojave Desert
Distribution outside California: se Oregon, w Nevada, nw Arizona
Flowering time: Springearly summer
Horticultural information: DRN, SUN, DRY: 1, 2, 3, 7, 8, 9, 10, 11, 12, 14, 15, 16, 18, 19, 20, 21, 22, 23, 24.