|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
For up-to-date information about California vascular plants, visit the Jepson eFlora.
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.
|YOU CAN HELP US make sure that our distributional information is correct and current. If you know that a plant occurs in a wild, reproducing state in a Jepson bioregion NOT highlighted on the map, please contact us with that information. Please realize that we cannot incorporate range extensions without access to a voucher specimen, which should (ultimately) be deposited in an herbarium. You can send the pressed, dried collection (with complete locality information indicated) to us (e-mail us for details) or refer us to an accessioned herbarium specimen. Non-occurrence of a plant in an indicated area is difficult to document, but we will especially value your input on those types of possible errors (see automatic conversion of distribution data to maps).|