|Jepson Flora Project: Jepson Interchange|
|TREATMENT FROM THE JEPSON MANUAL (1993)||
previous taxon |
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, perennial herb, shrubs, generally scented
Leaves pinnately divided or compound in CA, opposite below, opposite or alternate above, sessile or petioled, dotted with embedded oil glands
Inflorescence: heads generally radiate, small to large and showy, peduncled, solitary or in terminal, leafy cymes; involucre cylindric to bell-shaped; phyllaries in 1 series, all equal, fused, gland-dotted; receptacle naked
Ray flowers (0)1many; corollas white to yellow, orange, or brown; style tips long, tapered
Disk flowers 3many; corollas yellow to orange
Fruit cylindric; pappus of scales, sometimes with 1 or more awns
Species in genus: ± 50 species: North America., South America. ±
TOXIC to root-parasite nematodes.
Annual 210 dm, erect, glabrous
Leaves: leaflets serrate or dentate
Inflorescence: heads many in terminal cymes; peduncles 55.5 mm, slender; involucre 710 mm, narrowly cylindric; phyllaries 35, not splitting apart
Ray flowers 13; corollas pale yellow; ligules 12 mm, inconspicuous
Disk flowers 35; corollas 34 mm, yellow
Fruit 4.57 mm; pappus of 12 acuminate scales (each 23 mm) and 35 ovate to lanceolate scales (each 0.51 mm)
Ecology: Disturbed places
Elevation: < 1000 m.
Bioregional distribution: s Sierra Nevada Foothills, s San Joaquin Valley (especially Tulare Co.), San Francisco Bay Area, s South Coast Ranges, w Western Transverse Ranges
Distribution outside California: native to w S.America
Weedy. Sometimes cultivated.
May cause contact dermatitis in susceptible individuals.