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

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

ASTERACEAE

SUNFLOWER FAMILY

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.

CHRYSOTHAMNUS

RABBITBRUSH

Loran C. Anderson

Perennial to shrub
Stems erect, often densely clustered
Leaves alternate, sessile, entire
Inflorescence: heads discoid, arrayed in ± dense cymes, peduncled or subsessile; involucre generally cylindric; phyllaries generally in 3–5 series (± 5 vertical ranks), free, overlapping, keeled; receptacle naked
Flowers 2–20 (often 5) per head; corollas generally yellow, lobes 0.5–3 mm, generally spreading; style branches long, slender, generally exserted
Fruit narrowly cylindric, ± 5-ridged, generally light brown; pappus of many white to brownish bristles
Species in genus: 16 species: sw Can to n Mex
Etymology: (Greek: golden shrub)
Closely related to (perhaps part of) Ericameria.

Native

C. greenei (A. Gray) Greene

Shrub 1–2 dm
Stems generally glabrous
Leaves 1–2 cm, thread-like, straight or twisted
Inflorescence: heads in dense cymes; involucre 5–8 mm, cylindric; phyllaries widely lanceolate, clearly vertically ranked, weakly keeled, tips (at least outer) generally ascending, long-tapered, sticky
Flowers 4–5; corollas 4–5 mm; style appendage < stigma
Fruit 3–3.5 mm, hairy; pappus < corolla
Chromosomes: 2n=18
Ecology: Uncommon. Sandy washes
Elevation: 1340–1830 m.
Bioregional distribution: East of Sierra Nevada (Fish Lake Valley), n Desert Mountains (Cottonwood Mtns)
Distribution outside California: to Colorado, New Mexico
See the CNPS Inventory for information about endangerment and rarity.
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