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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California

  • Up-to-date information about California vascular plants is available from the Jepson eFlora.



David J. Keil, Family Editor and author, except as specified

Annual to tree
Leaves basal or cauline, alternate to whorled, simple to compound
Inflorescence: 1° inflorescence a head, each resembling a flower, 1–many, generally arrayed in cymes, generally subtended by ± calyx-like involucre; flowers 1–many 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)4–5; stamens 4–5, 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):1–28. See glossary p. 25 for illustrations of general family characteristics.


Species in genus: 1 sp
Etymology: (J.D. Whitney, CA geologist, 1819–1896)


W. dealbata A. Gray

Perennial 15–35 cm, densely covered with short, curly hairs and sessile glands
Stems erect from long, branched rhizome
Leaves basal and opposite; lower petioled, 5–10 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 1–2 cm diam, hemispheric or bell-shaped; phyllaries 5–12 in 1 series, 8–11 mm, oblong or elliptic; receptacle rounded, naked
Ray flowers 5–12 (1 per phyllary); ligules 10–25 mm, yellow, when dry papery and persistent on fruit
Disk flowers many, functionally staminate; corolla 6–7 mm, yellow; style included, ovary not maturing
Fruit 4–5 mm, oblong, ± flattened, brown or black, short-hairy; pappus 0
Ecology: Open forests, meadows, slopes
Elevation: 1200–2400 m.
Bioregional distribution: Cascade Range, n&c Sierra Nevada
Horticultural information: TRY
Recent taxonomic note: Arnica dealbata (A. Gray) B.G. Baldwin

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