|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 ± tomentose
Leaves alternate and generally clustered in axils, linear to (ob)lanceolate, sometimes persisting as stiff spines, glabrous to tomentose
Inflorescence: heads discoid, axillary or in ± rounded, terminal clusters; involucre cylindric to hemispheric; phyllaries in 12 ± equal series, often keeled; receptacle naked
Disk flowers generally 48; corollas cream to yellow, lobes long, spreading; anther bases ± sagittate, tips obtuse or acute; style branches papillate to short-bristly, tips truncate to conic
Fruit obconic or fusiform, often angled; pappus 0 or of generally many bristles or slender scales
Species in genus: 10 species: w North America
Etymology: (Greek: 4 together, from 4-flowered heads of some)
Reference: [Strother 1974 Brittonia 26:177202]
Esp flower buds TOXIC to sheep (toxicity poorly understood).
Plant < 12 dm, unarmed
Stems unevenly tomentose, becoming ± glabrous in stripes below nodes
Leaves: main leaves 510(20) mm, narrowly awl-shaped, ascending to appressed, sparsely woolly or becoming glabrous; clustered leaves 310(15) mm, thread- to ± club-like, glabrous
Inflorescence: heads generally 37; peduncles generally 510 mm, bracts 0; involucre 710 mm, obconic; phyllaries 4, lanceolate to obovate
Flowers 4; corollas 910 mm, cream to golden yellow
Fruit 35 mm, short-stiff-hairy; ribs glandular; pappus of many fine bristles, 68 mm
Ecology: Sagebrush scrub, pinyon/juniper or Joshua-tree woodland
Elevation: 8002400 m.
Bioregional distribution: Great Basin Floristic Province, Mojave Desert
Distribution outside California: to Oregon, Idaho, Utah
Flowering time: MayJul
Horticultural information: TRY.