|Jepson Flora Project: Jepson Interchange|
|TREATMENT FROM THE JEPSON MANUAL (1993)||
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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
AND IS MAINTAINED FOR ARCHIVAL PURPOSES ONLY
Annual to tree
Leaves basal or cauline, alternate to whorled, simple to compound
Inflorescence: 1° inflorescence a head, each resembling a flower, 1many, generally arrayed in cymes, generally subtended by ± calyx-like involucre; flowers 1many 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)45; stamens 45, 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):128. See glossary p. 25 for illustrations of general family characteristics.
Stems generally many from base
Leaves alternate, generally drought-deciduous, simple, petioled, entire or rarely toothed
Inflorescence: heads radiate or discoid, solitary or in cyme-like panicles; peduncles generally long; involucre hemispheric; phyllaries in 23 series, free; receptacle chaffy, scales folded around fruits and falling with them
Ray flowers sterile; style 0; ligules yellow
Disk flowers many; corollas yellow or brown-purple, tube slender, throat abruptly expanded, lobes triangular; anther tips ovate, ± acute; style tips triangular
Fruit strongly compressed, obovate or wedge-shaped; edges long-ciliate; faces glabrous or short-hairy; pappus of 2 narrow scales or 0
Species in genus: 13 species: w North America, w South America
Etymology: (Christopher Encel, 16th century)
Commonly hybridizing, especially in disturbed areas; E. farinosa X E. frutescens is common; E. farinosa X E. californica, E. farinosa X E. actoni, E. actoni X E. frutescens, E. frutescens X E. virginensis, E. farinosa X Geraea canescens have been reported.
Shrub 512 dm with fewmany branches from 1several short trunks
Stems branched along their length; young stems hairy; older with rough bark
Leaves scattered along stems; petioles 515 mm; blades 15 cm, elliptic, lanceolate, or narrowly ovate, obtuse, gray-green, lightly tomentose with some strigose hairs
Inflorescence: heads radiate or sometimes discoid, 25 in loose panicles; peduncles glabrous or strigose; involucre 512 mm; phyllaries lanceolate
Ray flowers 111; ligules 520 mm, deeply 3-lobed
Disk flowers: corollas 56 mm, yellow
Fruit 58 mm; pappus 2 slender scales or 0
Ecology: Roadsides, waste places, desert washes, flats
Elevation: < 800 m.
Bioregional distribution: Desert
Distribution outside California: w Arizona, n Baja California
Hybrids and backcrosses commonly found with parent species. Many herbarium specimens of " E. virginensis " are these.