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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.



Perennial from stout, taprooted caudex, generally ± unbranched
Leaves alternate, generally reduced upward; petiole generally << blade, often winged
Inflorescence: heads generally radiate, 1–few, ± large; involucre hemispheric or bell-shaped; phyllaries ± many in 2–3 series, outer often ± leaf-like; receptacle ± convex; chaff scales ± linear, entire, generally ± hairy
Ray flowers (0)5–20; ligules yellow
Disk flowers many; corollas yellow, lobes short; anthers brown or yellow, tips triangular; style tips linear, tapered
Fruit: pappus 0 or crown of scales; ray achenes 3-angled; disk achenes 4-angled, sometimes ± compressed
Etymology: (Nathaniel J. Wyeth, US explorer, 1802–1856)
Reference: [Weber 1946 Amer Midl Naturalist 35:400–452]


W. angustifolia (DC.) Nutt.

Plant 3–9 dm, ± rough-hairy
Leaves: basal blades 10–50 cm, oblanceolate
Inflorescence: peduncle 20–30 cm, soft-hairy; involucre 3–4 cm diam, hemispheric; phyllaries 20–30 mm, linear to ± lanceolate, generally not leaf-like, soft-hairy, ciliate; chaff scales 13–15 mm
Ray flowers 8–21; ligules 15–45 mm
Disk flowers: corollas 10–11 mm
Fruit 7–8 mm, ± hairy; pappus of 1–4 awn-tipped scales, 7–9 mm (and sometimes crown of smaller scales)
Chromosomes: 2n=38
Ecology: Grassland,
Elevation: < 2000 m.
Bioregional distribution: Northwestern California, Sierra Nevada, South Coast Ranges
Distribution outside California: to Washington
Horticultural information: SUN, DRN: 1, 4, 5, 6, 7, 14, 15, 16, 17, 18 &IRR: 8, 9, 19, 20, 21, 22, 23, 24.

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