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. |
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.
Species in genus: 1 sp.: w US
Etymology: (Daniel C. Eaton, American botanist, 18341895)
Native |
Annual 14 cm, densely tomentose
Stems congested
Leaves basal and alternate, very crowded, generally 1 cm or less, linear to obovate, entire
Inflorescence: heads radiate, solitary, terminal, subsessile, in flower ± concealed by leaves; peduncle in fruit elongating to ± 1 cm; involucre 45 mm diam, bell-shaped; phyllaries 812 in 1 series, 45 mm, linear-oblong, free, in fruit reflexed; receptacle flat, naked
Ray flowers 1 per phyllary, inconspicuous; ligules 1.52.5 mm, light yellow, often drying ± purple
Disk flowers many; corollas 2 mm, 45-lobed, yellow
Fruit ± 3 mm, oblanceolate, flattened; surfaces glabrous, black and shiny; margins ciliate with long, white hairs; pappus of 2 fringed scales 12 mm
Chromosomes: 2n=19
Ecology: Sandy soil
Elevation: 13502900 m.
Bioregional distribution: Great Basin Floristic Province
Distribution outside California: se Oregon, w Nevada
Flowering time: MayJun
Horticultural information: TRY.