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.



John C. Semple

Annual to perennial herb, taprooted, branched above, strigose-bristly; hairs minutely knobby
Leaves generally ± cauline, alternate; lower oblanceolate to ovate, base or petiole ± spreading-hairy; upper reduced, glandular
Inflorescence ± flat-topped; heads generally radiate; involucre ± bell-shaped; phyllaries in 3–5 graded series; receptacle naked, pitted
Ray flowers (0)10–30(40); ligules yellow
Disk flowers many; corollas yellow; style branches finely papillate, appendage narrowly triangular
Fruit obconic; ray fruit ± 3-angled, pappus 0 or of bristles; disk fruit compressed, outer pappus of narrow scales < 1 mm, inner of 30–45 bristles 3–7 mm
Species in genus: ± 30 species: especially w North America
Etymology: (Greek: different cases, from ray and disk fruits)
Reference: [Semple 1990 Brittonia 42:221–228]

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