|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 < 18 cm, ± green to gray-woolly
Leaves alternate or seeming whorled; base hard, yellowish; blade oblanceolate to ± round, entire
Inflorescence: heads disciform, sessile, 1many above (sometimes scattered below), leafy-bracted, < 5 mm; phyllaries 0; receptacle conic, ± acuminate, short-shiny-bristly; chaff scales phyllary-like, subtending flowers, flat to concave, persistent, rigid, outer acute, ± glabrous, inner obtuse, finely woolly inside
Pistillate flowers in 15 series, cylindric
Disk flowers staminate, 26(12), ± bilateral, 35-lobed
Fruit obovoid, compressed front-to-back, ± angled, smooth, dull, ± black-banded near base; pappus 0
Species in genus: 3 species: CA, s OR
Etymology: (Greek: western Evax )
Reference: [Morefield 1992 Syst Bot 17:293310]
Segregated from Evax ; closest to Ancistrocarphus. Evax multicaulis DC. and E. prolifera of AZ & NM not adequately documented from CA.
See the CNPS Inventory for information about endangerment and rarity.
Stems 0few, erect, < 18 cm
Leaves ± crowded near stem tips, long-petioled, longest generally 3390 mm, 720 mm wide
Inflorescence: upper heads in dense groups of 1040 subtended by generally 1020 leaves, 35 mm, 2.54 mm wide, largest group > 9 mm wide; lower heads 0; receptacle < 2 X longer than wide; chaff in 5 vertical ranks, inner scales 34 mm, tip exserted, spreading over outer scales
Pistillate flowers in 24 series
Disk flowers 1.11.6 mm
Fruit generally 1.52 mm
Ecology: Dry mud of vernal pools and flats
Elevation: 0500 m.
Bioregional distribution: s Sierra Nevada Foothills, n&c Great Central Valley, sw Peninsular Ranges
Synonyms: Evax c. (Benth.) A. Gray; E. acaulis Greene (1894); E. a. (Kellogg) Greene (1883) misapplied
Tall, narrow-lvd plants have been called E. involucrata Greene. Becoming uncommon.