Jepson Flora Project: Jepson Interchange    

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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, subshrubs
Leaves simple or ternately dissected, opposite or alternate, sessile or petioled, dotted with resin glands
Inflorescence: heads radiate, in few–many-headed cymes; involucre hemispheric or bell-shaped; phyllaries in 1–3 series, free, ± equal, reflexed in age; receptacle flat or slightly rounded, naked
Ray flowers 5–20; ligules yellow or white
Disk flowers generally many; corollas yellow, radial or outer bilateral; style tips obtuse
Fruit 4-sided, narrowly obpyramidal; pappus scales (0)8–15, lanceolate to obovate
Species in genus: 12 species: sw US, Mex, South America
Etymology: (J.F. Bahi, botany professor, Barcelona)
Reference: [Ellison 1964 Rhodora 66:67–86,177–215,281–311]


B. dissecta (A. Gray) Britton

Annual, biennial
Stem generally 1, erect, 2–12 dm, openly branched above, glandular
Leaves alternate; petiole 1–6 cm or upper leaves sessile; blade 1–3.5 cm, 1–several X ternately divided into linear to oblong segments 1–5 mm wide, strigose or hairs short, spreading
Inflorescence many-headed, panicle-like; peduncles 0.7–7 cm; involucre 7–10 mm diam, hemispheric to widely bell-shaped; phyllaries 12–24 in 2–3 series, 4.5–6 mm, oblanceolate or lanceolate, acuminate, soft-hairy, glandular
Ray flowers 10–20; ligules 5–7.5 mm, yellow
Disk flowers: corollas radial or bilateral, 2.5–4.5 mm; stamens often abortive
Fruit 3–4.5 mm, dark brown or black, glabrous to short-rough-hairy; pappus 0 (rarely scales 1–13, 1.5–3 mm, lanceolate)
Chromosomes: 2n=36
Ecology: Dry, open, forest slopes
Elevation: 1800–2650 m.
Bioregional distribution: San Bernardino Mountains, e Peninsular Ranges (Santa Rosa Mtns), e Desert Mountains
Distribution outside California: to Wyoming, Colorado, Texas, n Mexico
Flowering time: Aug–Sep
Triploid, reproducing asexually.

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