|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.
Annual to shrub, monoecious
Leaves often opposite below, generally alternate above, generally petioled, hairy, glandular
Inflorescence: staminate heads generally many in ± spikes or racemes, phyllaries fused into shallow cup; pistillate heads generally clustered below staminate, generally spiny, bur-like; involucre ± 0; receptacle chaffy; chaff scales spirally arrayed, fused below, tips generally becoming spiny; each pistillate flower in separate chamber
Staminate flowers ± many; corolla yellow or translucent; anthers free; style unbranched
Pistillate flowers 15; corolla 0; style branches long
Fruit enclosed in bur; pappus 0
Etymology: (Greek: early name for aromatic plants; the mythic food of the gods)
[Payne 1976 Plant Syst Evol 125:169178] Closely related to (indistinct from) Hymenoclea [Miao et al. 1995 Amer J Bot 82:924932; Baldwin et al. 1996 Madroño 43:1527]Wind-blown pollen often highly allergenic.
Perennial < 5 dm, from rhizome-like roots, generally few-branchedSee the CNPS Inventory for information about endangerment and rarity.
Stems green to straw-colored, densely short-hairy
Leaves: petioles with lobed wings; blades 313 cm, lanceolate to widely ovate, 24-pinnate, softly gray-white-hairy
Inflorescence: staminate heads 35 mm diam, involucre lobes 58, obscure, widely obtuse; pistillate heads 1-flowered
Fruit: burs < 2 mm, obovoid, ± brown, puberulent; spines (0)15, vestigial, scattered
Ecology: Disturbed sites
Elevation: < 150 m.
Bioregional distribution: s South Coast (Riverside and San Diego cos.)
Distribution outside California: Baja California