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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.


Annual, biennial, perennial herb, taprooted
Stems 1–several from base, erect, simple or much-branched above
Leaves basal and cauline, alternate; lower petioled, pinnately or ternately dissected into narrow lobes; upper reduced, sessile
Inflorescence: heads radiate or discoid, in many-headed, ± flat-topped clusters; peduncles slender; involucre obconic to hemispheric; phyllaries in 1–2 ± equal series, free; receptacle rounded, naked
Ray flowers 0 (in CA) or few; ligules yellow
Disk flowers few–many; corollas white to yellow; anther tips triangular; style tips narrowly triangular
Fruit club-shaped, 4–5-angled, ± hairy; pappus of 10–15 bristle-tipped scales
Species in genus: 5 species: sw US, Mex
Etymology: (Greek: membranous bristle, from pappus)
Reference: [Turner 1962 Brittonia 14:101–119]


H. loomisii S.F. Blake

Annual, biennial, or short-lived perennial herb, < or = 1.5 m
Leaves dissected into 1–2 mm wide linear lobes, glabrous or short-hairy
Inflorescence: peduncles 1–7 cm, bracts 0 or scattered, linear; involucre obconic; phyllaries 3–5 mm, linear, obtuse to acute, tips often cream, glabrous to gland-dotted or puberulent
Flowers: corollas 5–7 mm, cream, outer often larger than inner, ± bilateral; anthers 2–3 mm, yellow to light brown
Fruit 3–5 mm; pappus scales 3–7 mm
Chromosomes: 2n=48
Ecology: Disturbed sites
Elevation: < 1000 m.
Bioregional distribution: Sierra Nevada Foothills, Southwestern California
Distribution outside California: native to Arizona

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