|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.
Perennial generally from long, naked rhizome
Leaves: basal 0 or generally withered by flower; cauline opposite
Inflorescence ± flat-topped; heads radiate or discoid, 1many; involucre hemispheric to obconic; phyllaries generally in 2 ± equal series; receptacle ± flat, naked
Ray flowers (0)621; ligules (orange-)yellow
Disk flowers many; corolla generally soft-hairy, colored like ligules; anther bases entire or slightly sagittate, tips triangular; style branches flat, tips truncate, very short, hair-tufted
Fruit ± cylindric, 510-veined; pappus of many barbed to subplumose bristles, white to red-brown
Species in genus: ± 27 species: North America, Eurasia
Etymology: (Latin or Greek: ancient name)
Reference: [Downie & Denford 1988 Rhodora 90:245275]
Diploid species sexual; polyploid species generally form seeds asexually.
Plant 16 dm, from short, densely scaly, branched rhizome, stalked-glandular, generally hairy, especially upward; axils brown-woolly-tuftedSee the CNPS Inventory for information about endangerment and rarity.
Stems 1several, unbranched
Leaves: basal persistent, petioled, blade 312 cm, narrowly elliptic to oblanceolate, ± entire; cauline 24 pairs, reduced upward
Inflorescence: heads radiate, 1(3); involucre 1015 mm, widely hemispheric; phyllaries generally ± obtuse, glandular, hairy on both faces, ± ciliate
Disk flowers: corolla hairy, stalked-glandular
Ray flowers ± 13 or 21; ligules 13 cm
Fruit 46 mm, forked-hairy; pappus short-barbed, white or pale straw-colored
Ecology: Open, damp depressions in sagebrush scrub or grassland
Elevation: 18002700 m.
Bioregional distribution: n High Sierra Nevada (e slope), Modoc Plateau
Distribution outside California: to British Columbia, c N.America, Colorado