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.



John S. Mooring and Dale E. Johnson

Annual to shrubs, ± woolly
Leaves generally alternate, entire to nearly compound
Inflorescence: heads 1–many, generally radiate; cluster often ± flat-topped; involucre obconic to hemispheric; phyllaries in 1 series, free or ± fused; receptacle flat to columnar, generally naked
Ray flowers generally ± 1 per phyllary; ligules entire to lobed, generally yellow (white)
Disk flowers (3)10–300; corolla yellow; anther tips ovate, deltate or awl-shaped
Fruit 4-angled or flattened in outer flowers, generally club-shaped in inner flowers; pappus 0–15 ± jagged or fringed scales
Species in genus: 14 species: w North America
Etymology: (Greek: woolly leaf)
Reference: [Mooring 1991 Madroño 38:213–226]
Annual species by Dale E. Johnson.


E. ambiguum (A. Gray) A. Gray

Annual 5–30 cm, decumbent to ascending
Leaf < 4 cm, oblong-oblanceolate, entire to shallowly lobed
Inflorescence: head 1; peduncle 1–8 cm; involucre 3–6 mm, obconic to hemispheric; phyllaries 6–10, acuminate; receptacle conic
Ray flowers 6–10; ligules 2–10 mm
Disk flowers many; corollas 1.3–3 mm, tube and throat hairy; anther tips deltate, smooth
Fruit 2.2–3 mm, ± strigose; pappus 0 or < 0.5 mm
Chromosomes: 2n=14
Ecology: Woodland, desert
Elevation: < 2800 m.
Bioregional distribution: s Sierra Nevada Foothills, Tehachapi Mountain Area, East of Sierra Nevada, Desert
Distribution outside California: s Nevada


var. paleaceum (Brandegee) Ferris

Leaf entire or 3-lobed near tip
Inflorescence: involucre 5–7 mm; phyllaries free; receptacle tip sometimes scaly
Disk flowers: corolla lobes with 1-celled hairs
Fruit: pappus 0 or scales entire, < 0.2 mm
Ecology: Desert scrub or woodland
Elevation: 100–2800 m.
Bioregional distribution: s Sierra Nevada Foothills, Tehachapi Mountain Area, East of Sierra Nevada, Desert
Distribution outside California: s Nevada
Flowering time: Apr–Jun
Horticultural information: TRY.

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