|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.
Species in genus: 1 sp.: w North America
Etymology: (Greek: 2 numbers, from 2-flowered head)
Reference: [Morton 1978 North America Fl II 2:4749]
Annual generally < 4 cm, tufted, cobwebby at base, ± glandular aboveSee the CNPS Inventory for information about endangerment and rarity.
Leaves opposite, 13 cm, short-petioled, oblanceolate to ovate, entire, clustered around heads
Inflorescence: heads discoid, generally in sessile clusters; involucre 46 mm, narrowly bell-shaped; phyllaries 23, each subtending a flower, ± fused at base, obovate, tip rounded, back convex; receptacle naked
Flowers 23; corollas 46 mm, tube and throat ± purple, lobes spreading, white to purple; anther bases sagittate, tips ± triangular; style branches ± flat, ± papillate, tip slightly expanded, rounded
Fruit ± 3 mm, cylindric, ribbed, glabrous; pappus bristles ± 20, 35 mm, plumose, fused at base
Ecology: UNCOMMON. Dry volcanic soils
Elevation: 16002300 m.
Bioregional distribution: Modoc Plateau
Distribution outside California: to sw Idaho, nw Nevada
Horticultural information: TRY; DFCLT.