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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
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ASTERACEAE

SUNFLOWER FAMILY

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.

HESPEREVAX

James D. Morefield

Annual < 18 cm, ± green to gray-woolly
Leaves alternate or seeming whorled; base hard, yellowish; blade oblanceolate to ± round, entire
Inflorescence: heads disciform, sessile, 1–many 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 1–5 series, cylindric
Disk flowers staminate, 2–6(12), ± bilateral, 3–5-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 17:293–310]
Segregated from Evax ; closest to Ancistrocarphus. Evax multicaulis DC. and E. prolifera of AZ & NM not adequately documented from CA.

Native

H. sparsiflora (A. Gray) Greene


Stems generally several, ascending to erect, < 18 cm
Leaves ± equal, ± evenly spaced, petioled; longest 6–30 mm, 2–10 mm wide
Inflorescence: upper heads in loose groups of 3–5 subtended by generally 1–4 leaves and mixed with leaves, 3–4.5 mm, 1.5–2 mm wide, groups < 5 mm wide; lower heads ± = upper; receptacle 2+ y longer than wide; chaff in spiral ranks, inner scales 1.1–1.8 mm, tip included, ± erect
Pistillate flowers in 1–3 series
Disk flowers 0.8–1.1 mm
Fruit generally 1–1.7 mm
Ecology: Sandy soils or serpentine
Elevation: < 900 m.
Bioregional distribution: North Coast, s North Coast Ranges, deltaic Great Central Valley, Central Western California, Channel Islands, sw Peninsular Ranges
Distribution outside California: sw Oregon
Varieties distinctive; some intermediates may occur in SnFrB.

Native

var. sparsiflora


Stems < 18 cm
Leaves: longest generally 13–30 mm; blade ± obovate, obtuse to acute, grayish to greenish, cobwebby
Inflorescence: longest heads 3.6–4.5 mm
Ecology: Common. Open, generally serpentine soil
Elevation: 10–900 m.
Bioregional distribution: s North Coast Ranges, deltaic Great Central Valley, Central Western California, Channel Islands, sw Peninsular Ranges
Synonyms: Evax s. (A. Gray) Jeps
Santa Rosa Island plants are uniformly stem- less.

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bioregional map for HESPEREVAX%20sparsiflora%20var.%20sparsiflora being generated
 
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Retrieve Jepson Interchange Index to Plant Names entry for Hesperevax sparsiflora var. sparsiflora
Retrieve dichotomous key for Hesperevax
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Overlay Consortium of California Herbaria specimen data by county on this map
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