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.
Annual, biennial, perennial herb
Stems erect, simple to much-branched
Leaves simple, basal or alternate, sessile or petioled, entire or divided 1 or more times into linear lobes, dotted with sunken resin glands
Inflorescence: heads generally radiate, solitary or in fewmany-headed cymes; involucre hemispheric; phyllaries in 23 similar or dissimilar series; receptacle flat to rounded, naked
Ray flowers fewmany; corolla yellow, fan-shaped, 35-lobed
Disk flowers many; corolla yellow
Fruit obpyramidal, generally 5-angled, hairy; pappus of ± 5 membranous, often awn-tipped scales
Species in genus: 28 species: w North America, South America
Etymology: (Greek: sharp membrane, from pappus)
Horticultural information: TRY.
Native |
Biennial or short-lived perennial herb 1590 cm, lightly canescent with soft, white, jointed hairs, ± glabrous in age
Stem generally branched above middle
Leaves basal and cauline, 49 cm, divided into 12 mm wide linear lobes
Inflorescence: heads in ± flat- topped cyme; peduncles > 10 cm; involucre generally 910 mm diam; outer phyllaries fused at base, 57 mm, < or = inner series
Ray flowers 814; ligules 1013 mm
Disk flowers: corolla 3.54.5 mm
Fruit ± 3 mm; pappus scales, 12 mm, ovate, entire or short-awn-tipped
Chromosomes: 2n=30
Ecology: Dry, rocky slopes
Elevation: 12002000 m.
Bioregional distribution: Desert Mountains
Distribution outside California: Nevada, Arizona
Flowering time: MayJun, SepOct