TREATMENT FROM THE JEPSON MANUAL (1993) |
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©Copyright 1993 by the Regents of the University of California
For up-to-date information about California vascular plants, visit the Jepson eFlora. |
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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 generally from long, naked rhizome
Leaves: basal 0 or generally withered by flower; cauline opposite
Inflorescence ± flat-topped; heads radiate or discoid, 1many; involucre hemispheric to obconic; phyllaries generally in 2 ± equal series; receptacle ± flat, naked
Ray flowers (0)621; ligules (orange-)yellow
Disk flowers many; corolla generally soft-hairy, colored like ligules; anther bases entire or slightly sagittate, tips triangular; style branches flat, tips truncate, very short, hair-tufted
Fruit ± cylindric, 510-veined; pappus of many barbed to subplumose bristles, white to red-brown
Species in genus: ± 27 species: North America, Eurasia
Etymology: (Latin or Greek: ancient name)
Reference: [Downie & Denford 1988 Rhodora 90:245275]
Diploid species sexual; polyploid species generally form seeds asexually.
Native |
Plant 15 dm from short, sparsely scaly rhizome, stalked-glandular, unevenly hairy upward; axils often sparsely white-hairy
Stems 1several, branched or not
Leaves: cauline 36 pairs, lower petioled, blades 414 cm, ± oblanceolate, (sub)entire; upper leaves sessile, reduced
Inflorescence: heads radiate, 15; involucre 1015 mm, widely hemispheric; phyllaries acute, stalked-glandular, hairy, ciliate, inner face glabrous
Disk flowers: corollas stalked-glandular
Ray flowers 817; ligules 13 cm
Fruit 35.5 mm, hairy, sometimes sparsely glandular; pappus short-barbed, white
Chromosomes: 2n=38
Ecology: Open sagebrush scrub
Elevation: 14001800 m.
Bioregional distribution: Great Basin Floristic Province
Distribution outside California: to w Canada, Wyoming
Flowering time: MayAug
Similar to A. fulgens.