|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, 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.
Biennial or perennial herb 450 cm, persistently tomentose or glabrous in ageSee the CNPS Inventory for information about endangerment and rarity.
Stems often > 1, generally branched above middle
Leaves basal and cauline, 29 cm, divided into 15 mm wide linear lobes
Inflorescence: heads in ± flat-topped cyme; peduncles generally < 8 cm; involucre generally 15 mm diam or more; outer phyllaries fused at base, 57 mm, < or = inner series
Ray flowers 814; ligules 1015 mm
Disk flowers: corolla 3.54.5 mm
Fruit ± 3 mm; pappus scales, 12 mm, lanceolate to ovate, entire
Ecology: Meadows or dry, rocky slopes
Elevation: 7003500 m.
Bioregional distribution: e Klamath Ranges, Great Basin Floristic Province
Distribution outside California: se Oregon, s Idaho, Nevada, Utah
Flowering time: JunAug
The dwarf, subalpine form has been called H. cooperi (A. Gray) Cockerell var. canescens (D.C. Eaton) K.L. Parker.