|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, often matted, dioecious; staminate plants generally present
Leaves alternate, entire, generally ± tomentose
Inflorescence: heads discoid or disciform, 1 or in cyme-like clusters; phyllaries many in several series, papery or membranous (staminate wider, more conspicuous); receptacle naked
Staminate flowers 25 mm; corollas white, yellow, or red; pappus bristle tips generally enlarged
Pistillate flowers 210 mm; corollas barely lobed, white, yellow or red
Fruit 0.53.5 mm, ± elliptic; pappus bristles many, soft, weakly barbed
Species in genus: ± 40 species: Am, n Eurasia
Etymology: (Latin: antenna)
Reference: [Bayer 1990 Can J Bot 68:13891397 and Madroño 37:171183]
Many races reproduce by asexual seeds, their populations entirely pistillate plants.
Stems 615 cm, slender; stolons horizontal, 110 cm
Leaves: basal 1822 mm, spoon-shaped, 1-veined, thin, ± gray-tomentose; cauline 813 mm
Inflorescence: heads 37; involucres 45.3 mm, densely hairy below; phyllaries wide, tips blunt (staminate) or acute (pistillate), white, distinctly spotted blackish brown near base
Staminate flowers: corollas 23.2 mm
Pistillate flowers: corollas 2.53.5 mm
Fruit 0.51 mm, slightly papillate; pappus 3.54.5 mm
Ecology: Moist meadows, streamsides
Elevation: 19003200 m.
Bioregional distribution: High Sierra Nevada
Distribution outside California: to Oregon, sw Canada, Montana, Wyoming, Colorado
Horticultural information: TRY.