Jepson Flora Project: Jepson Interchange    

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

  • Up-to-date information about California vascular plants is available from the Jepson eFlora.



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.


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.


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.


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

Retrieve Jepson Interchange Index to Plant Names entry for Hesperevax sparsiflora var. sparsiflora
Retrieve dichotomous key for Hesperevax
Retrieve multiple-entry key (MEKA) for Hesperevax
Overlay Consortium of California Herbaria specimen data by county on this map
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