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


Curtis Clark

Annual, perennial herb
Stems erect; branches ascending
Leaves basal and alternate, simple, sessile or petioled, entire or toothed, 3-veined from base
Inflorescence: heads radiate or discoid, solitary or in few-headed panicles; peduncles ± elongated; involucre hemispheric; phyllaries in 2–3 series, free; receptacle chaffy, scales folded around fruits and falling with them
Ray flowers sterile; style 0; ligules yellow
Disk flowers many; corollas yellow, tube slender, throat gradually expanded, lobes triangular; anther tips ovate, ± acute; style tips triangular
Fruit strongly compressed, narrowly wedge-shaped; edges ± white, long-ciliate; faces black, ± hairy; pappus of 2 narrow awns
Species in genus: 2 species: sw US, nw Mex
Etymology: (Greek: old, from white-haired involucre)


G. canescens A. Gray


Annual, taprooted; herbage bristly or soft-hairy
Stems 1–8 dm, simple to openly much-branched
Leaves 1–10 cm, sessile above, wing-petioled below; blade lanceolate or ovate to elliptic or oblanceolate, green or ± canescent, tip acute, base tapering to wing, margin entire or dentate
Inflorescence: heads radiate, solitary or few–many in panicles; involucre 7–12 mm; phyllaries narrowly lanceolate, acute, green, ciliate
Ray flowers 10–21; ligules 1–2 cm
Disk flowers: corollas 4–5 mm
Fruit 6–7 mm; pappus awns 3–4 mm
Chromosomes: 2n=36
Ecology: Sandy desert soils
Elevation: < 1300 m.
Bioregional distribution: Desert
Distribution outside California: to sw Utah, w Arizona, n Mexico
Flowering time: Feb–May, Oct–Nov
Sometimes hybridizes with Encelia farinosa
Horticultural information: TRY.

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