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.
Species in genus: 1 sp
Etymology: (J.D. Whitney, CA geologist, 18191896)
Native |
Perennial 1535 cm, densely covered with short, curly hairs and sessile glands
Stems erect from long, branched rhizome
Leaves basal and opposite; lower petioled, 510 cm, elliptic to oblanceolate or obovate; upper sessile, smaller, narrower, all entire
Inflorescence: heads radiate, solitary or in few-headed, terminal cymes; peduncles slender; involucre 12 cm diam, hemispheric or bell-shaped; phyllaries 512 in 1 series, 811 mm, oblong or elliptic; receptacle rounded, naked
Ray flowers 512 (1 per phyllary); ligules 1025 mm, yellow, when dry papery and persistent on fruit
Disk flowers many, functionally staminate; corolla 67 mm, yellow; style included, ovary not maturing
Fruit 45 mm, oblong, ± flattened, brown or black, short-hairy; pappus 0
Ecology: Open forests, meadows, slopes
Elevation: 12002400 m.
Bioregional distribution: Cascade Range, n&c Sierra Nevada
Horticultural information: TRY
Recent taxonomic note: Arnica dealbata (A. Gray) B.G. Baldwin