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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.


Gregory K. Brown

Perennial from woody taproot
Stems 1–many, decumbent to erect, generally red-tinged
Leaves alternate, simple, glabrous to tomentose or glandular; basal petioled; cauline generally clasping, reduced
Inflorescence: heads generally radiate, 1–many; involucre hemispheric to bell-shaped; phyllaries in 2–6 ± graduated series, herbaceous
Ray flowers 10–80; corollas 2–35 mm, yellow
Disk flowers 20–100+; corollas 5–15 mm, cylindric to funnel-shaped, yellow
Fruit 3–4-angled, generally hairy; pappus bristles 15–60, generally rigid, unequal
Species in genus: ± 10 species: w North America
Etymology: (Greek: reddish pappus)
Reference: [Mayes 1976 PhD Univ TX]
Formerly included in Haplopappus.


P. uniflora (Hook.) Greene

Stems 7–38 cm
Leaves ± tomentose or woolly; basal 3–12 cm, (ob)lanceolate, sharply dentate to cut; cauline few, clasping, reduced
Inflorescence: heads 1(–4), in raceme-like cluster; involucre 6–13 mm, 11–20 mm diam, hemispheric; phyllaries barely or not overlapping in ± 2 series, 6–12 mm, ± linear, herbaceous, generally tomentose to woolly
Ray flowers 25–45; ligules 7–11 mm
Disk flowers 35–60; corollas 5–8 mm
Fruit ± 3–4 mm, 3–4-angled, silky; pappus ± 5–8 mm, tan
Ecology: Alkaline soils of mtn meadows, open forest, near hot springs
Elevation: 1400–2900 m.
Bioregional distribution: San Bernardino Mountains, Great Basin Floristic Province
Distribution outside California: to Oregon, Idaho, Montana, Wyoming, Colorado
Synonyms: Haplopappus u. (Hook.) Torr. & A. Gray

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