|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, perennial herb, shrubs
Stems slender to stout and fleshy
Leaves simple to several times pinnately dissected, basal or cauline, opposite or less commonly alternate, sessile or petioled
Inflorescence: heads radiate, solitary or in fewmany-headed cymes; peduncles short to long; involucre hemispheric or bell-shaped; phyllaries in 2 series, outer ± spreading, thick, green, inner thin, membranous; receptacle flat to rounded, chaffy; scales flat, scarious
Ray flowers fertile or sterile; ligules generally yellow, showy
Disk flowers many; corollas 45-lobed, yellow; style tips truncate to long-tapered
Fruit: ray and disk achenes alike or different, generally compressed front-to-back, often winged; pappus 0 or of 2 awns or scales
Species in genus: ± 114 species: Am, Africa
Etymology: (Greek: bedbug-like, from fruit)
Reference: [Smith 1984 Sida 10:276289]
Annual 525 cm, glabrousSee the CNPS Inventory for information about endangerment and rarity.
Stems 1many, erect
Leaves basal (or few cauline, alternate); petiole 13 cm; blade 520 mm, 12-pinnately divided into linear segments 1 mm wide, grooved above
Inflorescence: heads solitary, ± scapose; involucre cylindric, base truncate; outer phyllaries 47, 36 mm, linear; inner phyllaries 68, 58 mm, ovate, acute, margin scarious; chaff scales generally 56 mm, linear, free from disk achenes
Ray flowers 58, fertile; ligules 38 mm, oblong to obovate, reflexed, yellow
Disk flowers 2030; corollas ± 34.5 mm, yellow
Fruit: ray achenes 5 mm, obovate, brown or tan splotched with brown, smooth, glabrous, shiny; wing narrow; pappus 0; disk achenes 56 mm, obovate, tan splotched with brown, shiny, both surfaces covered with ascending hairs, margins ciliate, hairs 11.5 mm; pappus scales ± 1 mm, obovate
Ecology: Dry exposed slopes
Elevation: 6001300 m.
Bioregional distribution: e San Francisco Bay Area (Diablo Range)
Horticultural information: In cultivation.