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 115 dm, green to canescent, generally self-sterile
Leaves alternate (or lower opposite), linear to oblanceolate, entire to toothed; lower soon deciduous; upper ± bract-like
Inflorescence spike- to panicle-like; heads radiate, opening in evening, generally closing by ± midday, ± short-peduncled; phyllaries fully folded around ray ovaries, falling with fruits, tips flat, erect or spreading; receptacle flat, short-hairy; chaff scales 5 in ring between ray and disk flowers, weakly fused
Ray flowers 5; ligule 3-lobed, yellow, red-veined, often aging purplish
Disk flowers 6, staminate; corolla yellow; anthers black, tips widely triangular; ovaries slender, style branches undivided
Fruit: pappus 0; ray achenes compressed front-to-back
Species in genus: 4 species: CA
Etymology: (Greek: hare leaf, from copious leaf hairs)
Reference: [Thompson 1983 PhD Univ CA Davis]
Native |
Stems 0many-branched, soft-hairy, often becoming glabrous
Leaves: lower 312 cm, toothed, early deciduous; middle entire, deciduous, with axillary leaf clusters; upper bract-like, densely canescent to silvery-hairy, long-ciliate, uppermost glandular
Inflorescence head- to panicle-like, ± glandular; heads generally closing early morning; involucre obconic; phyllaries 4.47.5 mm, lanceolate, short-hairy, densely long-ciliate, tip < body
Ray flowers: ligules 35.5 mm, pale yellow
Disk flowers: corollas 3.54 mm
Fruit 2.54 mm, narrowly obovate, dull, ± black; midvein obscure
Chromosomes: 2n=14
Ecology: Many dry habitats
Elevation: < 1600 m.
Bioregional distribution: California Floristic Province, Modoc Plateau
Distribution outside California: to Washington, Idaho, Montana, n Nevada
Fls spring to autumn. Self-fertile.