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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
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David J. Keil, Family Editor and author, except as specified

Annual to tree
Leaves basal or cauline, alternate to whorled, simple to compound
Inflorescence: 1° inflorescence a head, each resembling a flower, 1–many, generally arrayed in cymes, generally subtended by ± calyx-like involucre; flowers 1–many 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)4–5; stamens 4–5, 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):1–28. See glossary p. 25 for illustrations of general family characteristics.


Stems prostrate to erect, often rooting below, simple to much-branched
Leaves simple, opposite, sessile
Inflorescence: heads radiate, small, solitary or in small cymes; peduncles short or 0; involucre hemispheric; phyllaries in 1–2 ± equal series, free, ovate; receptacle rounded, chaffy, scales narrowly linear, bristle-like
Ray flowers many; corollas white; ligules short, narrowly linear
Disk flowers many; corollas white; style branches very short, included; anthers brown, included
Fruit 4-angled, ± flat, brown, glabrous; pappus a crown of minute bristles or 0
Species in genus: 4 species: especially tropical
Etymology: (Greek: deficient, from absence of pappus)


E. prostrata (L.) L.

Plant ± strigose throughout
Stems 1–10 dm
Leaves: blades linear, lanceolate, or narrowly elliptic, entire or short-toothed, tip acute
Inflorescence: peduncles 0–15 mm; involucre 4–10 mm diam; phyllaries 4–5 mm, acute
Ray flowers: corolla 1.5–3 mm
Disk flowers: corolla 1.5–2 mm
Fruit 1.7–2.2 mm, obovate, smooth or ± warty; pappus < or = 0.2 mm
Chromosomes: 2n=12
Ecology: Damp places
Elevation: < 300 m.
Bioregional distribution: Great Central Valley, South Coast Ranges, Southwestern California, Sonoran Desert
Flowering time: All year
Synonyms: E. alba (L.) Hassk
A weed in all continents. Source of dark dye, medicine against roundworm parasites.

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bioregional map for ECLIPTA%20prostrata being generated

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