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.


Willard W. Payne

Annual, taprooted, much-branched, generally ± white-hairy
Leaves petioled, generally opposite below, alternate above
Inflorescence: heads disciform, many; involucre cup- to bell-shaped; phyllaries few in 1 series, small, free; receptacle chaffy
Pistillate flowers 0–2; corolla 0; style branches long
Staminate flowers 5–20; corolla greenish to dull purple; anthers free, exserted, filaments fused, attached at corolla tube base
Fruit compressed, winged, falling with chaff scale; pappus 0
Species in genus: 3–4 species: sw US, nw Mex
Etymology: (Greek: 2 bugs, from 2-fruit heads)


D. canescens A. Gray

Plant 3–9 dm, generally white-hairy
Leaves generally ± densely canescent; lower 3–5 cm, lanceolate to triangular-ovate, toothed, generally 3-veined; upper reduced, ± round, ± entire
Inflorescence: phyllaries generally 3–5, 2–5 mm, reflexed in age
Pistillate flowers generally 2
Staminate flowers: corolla ± 3 mm
Fruit 3–6 mm, ± keeled, glabrous, wings toothed
Chromosomes: 2n=36
Ecology: Sandy soil
Elevation: < 1300 m.
Bioregional distribution: Desert
Distribution outside California: to s Utah, w Arizona, nw Mexico
Flowering time: Sep–Jan
Highly variable; features vary ± independently
Synonyms: subspp. clarkiae (P.B. Kenn.) D.D. Keck and hispidula (Rydb.) D.D. Keck
Horticultural information: TRY; STBL.

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