Jepson Flora Project: Jepson Interchange    

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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
For up-to-date information about California vascular plants, visit 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. leiospermus (A. Gray) H.M. Hall & Clem.

Plant generally 3–6 dm
Stems generally leafless, yellowish
Leaves (if any) 1–3 cm, thread-like
Inflorescence: involucres 8–9.5 mm, generally straw-colored (purplish), glabrous
Flowers: corollas 6–7.5 mm, lobes erect or bent inward
Fruit glabrous
Ecology: Common. Dry sand, gravel, rocky crevices
Elevation: 700–2400 m.
Bioregional distribution: East of Sierra Nevada, Desert Mountains
Distribution outside California: to Utah, n Arizona
Horticultural information: TRY.

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bioregional map for CHRYSOTHAMNUS%20nauseosus%20subsp.%20leiospermus being generated
YOU CAN HELP US make sure that our distributional information is correct and current. If you know that a plant occurs in a wild, reproducing state in a Jepson bioregion NOT highlighted on the map, please contact us with that information. Please realize that we cannot incorporate range extensions without access to a voucher specimen, which should (ultimately) be deposited in an herbarium. You can send the pressed, dried collection (with complete locality information indicated) to us (e-mail us for details) or refer us to an accessioned herbarium specimen. Non-occurrence of a plant in an indicated area is difficult to document, but we will especially value your input on those types of possible errors (see automatic conversion of distribution data to maps).

Retrieve Jepson Interchange Index to Plant Names entry for Chrysothamnus nauseosus subsp. leiospermus
Retrieve dichotomous key for Chrysothamnus
Retrieve multiple-entry key (MEKA) for Chrysothamnus
Overlay Consortium of California Herbaria specimen data by county on this map
Show other taxa with the same California distribution | Read about bioregions | Get lists of plants in a bioregion
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