|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 < 20 dm, unarmedSee the CNPS Inventory for information about endangerment and rarity.
Leaves sparsely tomentose; main leaves 14 cm, linear, thread-like, soft; clustered leaves 1020 mm, thread-like to linear-oblanceolate
Inflorescence: heads generally 46 on short side branches; peduncles generally 13 mm, tomentose, bracts 02; involucre 89 mm, obconic; phyllaries 4(5), widely elliptic
Flowers 4(5); corollas ± 8 mm, pale yellow
Fruit 56 mm, densely long-soft-hairy; pappus of ± 20 stiff bristles or slender scales, 35 mm, ± hidden by fruit hairs
Ecology: Dunes, deep sand, sagebrush scrub
Elevation: 12002100 m.
Bioregional distribution: n East of Sierra Nevada
Distribution outside California: w Nevada