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.



Loran C. Anderson

Perennial to shrub
Stems erect, often densely clustered
Leaves alternate, sessile, entire
Inflorescence: heads discoid, arrayed in ± dense cymes, peduncled or subsessile; involucre generally cylindric; phyllaries generally in 3–5 series (± 5 vertical ranks), free, overlapping, keeled; receptacle naked
Flowers 2–20 (often 5) per head; corollas generally yellow, lobes 0.5–3 mm, generally spreading; style branches long, slender, generally exserted
Fruit narrowly cylindric, ± 5-ridged, generally light brown; pappus of many white to brownish bristles
Species in genus: 16 species: sw Can to n Mex
Etymology: (Greek: golden shrub)
Closely related to (perhaps part of) Ericameria.


C. nauseosus (Pall.) Britton


Shrub < 28 dm, ± tomentose; odor strong
Stems whitish to green, ± flexible, very leafy or naked at flower
Leaves 1–7 cm, thread-like to narrowly (ob)lanceolate
Inflorescence dense, flat-topped or rounded, panicle-like; involucre 6–14.5 mm, cylindric; phyllaries ± lanceolate to ovate, in vertical ranks, ± strongly keeled, firm, obtuse to acute
Flowers generally 5; corollas 6–12 mm; style appendage generally > stigma
Fruit 3–8 mm, generally hairy; pappus generally = corolla
Chromosomes: 2n=18
Ecology: Diverse habitats
Elevation: 50–3300 m.
Bioregional distribution: Northwestern California, Cascade Range, Sierra Nevada, Central Western California (except Central Coast), Transverse Ranges, Peninsular Ranges, Great Basin Floristic Province, Mojave Desert
Distribution outside California: to British Columbia, Montana, Wyoming, Colorado, New Mexico, Baja California
Highly variable; 22 subspp. in w US.


subsp. mohavensis (Greene) H.M. Hall & Clem.

Plant 5–28 dm
Stems few-branched, often ± leafless
Leaves (if any) 1.5–3 cm, thread-like
Inflorescence: involucres 8.5–12 mm, straw-colored, glabrous
Flowers: corollas 7–10.5 mm
Ecology: Common. Dry scrub
Elevation: 400–2400 m.
Bioregional distribution: San Francisco Bay Area (Mount Hamilton Range), Outer South Coast Ranges, s Inner South Coast Ranges, Transverse Ranges, Mojave Desert
Distribution outside California: s Nevada
Sometimes intergrades with subspp. consimilis, hololeucus.
Horticultural information: DRN, SUN, DRY: 1, 2, 3, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 18, 19, 20, 21.

Information on Distribution was contributed by John Game (Sep 8 2003):
UC/Jeps has a number of specimens from Santa Clara County, including Mount Umunum and Hamilton, and the County is checked in the County map

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bioregional map for CHRYSOTHAMNUS%20nauseosus%20subsp.%20mohavensis being generated

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