TREATMENT FROM THE JEPSON MANUAL (1993) |
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©Copyright 1993 by the Regents of the University of California
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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.
Perennial, subshrub, often from long, thick caudex, silky; hairs basally forked, attached off-center; herbage dotted with resin glands
Leaves alternate, often crowded at base; simple and entire or 3-lobed to 13-pinnately dissected
Inflorescence: heads disciform, fewmany; involucre hemispheric; phyllaries in 23 overlapping series, scarious-margined and -tipped; receptacle hemispheric, naked or hairy
Pistillate flowers few, marginal; corolla cylindric to lance-ovoid
Disk flowers more numerous; corolla tubular to bell-shaped; anther tips ovate, bases rounded or ± cordate; style branches truncate, tips shrub-like
Fruit cylindric, generally 510-ribbed; pappus generally 0 or a narrow crown
Species in genus: 9 species: w. North America
Etymology: (Greek: spherical division)
Reference: [Holmgren et al. 1976 Brittonia 28:255272]
Segregated from Tanacetum.
Native |
Perennial from elongate, thick woody caudex
Stems 430 cm, branched from base
Leaves < 10 cm, 13-pinnately divided; basal and lower cauline petioled, upper sessile
Inflorescence: heads generally 35, in open clusters (rarely solitary); receptacle hairy
Fruit < 2 mm, 5-ribbed, swelling when wet; pappus 0
Ecology: Mtn meadows, hot springs, alkaline areas
Elevation: 18002400 m.
Bioregional distribution: n&c High Sierra Nevada, Great Basin Floristic Province
Distribution outside California: to Oregon, Idaho, Nevada
Synonyms: Tanacetum p. A Gray