|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.
Shrubs < 50 dm, resinous, generally gland-dotted
Leaves < 10 cm, thread-like to wedge-shaped, entire
Inflorescence various; heads radiate or discoid; involucre 314 mm, obconic to hemispheric; phyllaries in 26 series, ± lanceolate to ovate, generally resinous, tips erect to recurved, obtuse to acuminate or tailed, midrib often thickened with a resin gland
Ray flowers 030; corollas 212 mm, generally yellow
Disk flowers 470+; corollas 311 mm, yellow
Fruit 28 mm, ribbed; pappus white to brown
Species in genus: ± 27 species: w North America
Reference: [Nesom 1990 Phytologia 68:144155]
Generally flowers summer/autumn. Some species hybridize with Chrysothamnus nauseosus.
Plant 1550 dm, very leafy, glabrous
Leaf 2060 mm, ± elliptic, acute, leathery
Inflorescence: heads discoid, in dense, terminal cymes; involucre 56.5 mm, 34 mm diam, obconic; phyllaries ± lanceolate, acute, whitish, midrib thick, brown
Disk flowers 818; corollas 56 mm
Fruit 22.5 mm, obconic, minutely hairy, veins 12 or fewer; pappus > disk corollas, copious, dull white to brown
Ecology: Dry slopes, chaparral, open forest, especially after fires
Elevation: 4002200 m.
Bioregional distribution: San Gabriel Mountains, San Bernardino Mountains, Peninsular Ranges
Synonyms: Haplopappus p. (Greene) S.F. Blake
Var. peninsularis (Moran) G.L. Nesom in n Baja CA. Sometimes treated as subsp. of E. arborescens
Horticultural information: TRY.