Jepson Flora Project: Jepson Interchange    

 
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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
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ASTERACEAE

SUNFLOWER FAMILY

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.

CHRYSOTHAMNUS

RABBITBRUSH

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.

Native

C. nauseosus (Pall.) Britton

RUBBER RABBITBRUSH

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.

Native

subsp. hololeucus (A. Gray) H.M. Hall & Clem.

Plant 3–25 dm, white to gray- or yellow-green
Leaves 3–7 cm (shorter in inflorescence), ± narrowly lanceolate, sometimes reflexed
Inflorescence: involucres generally 8–9 mm, straw-colored, less hairy inward; phyllary midribs brownish
Flowers: corollas 8–9.5 mm, lobes erect or bent inward
Ecology: Common. Well-drained granitic or limestone soils in scrub or woodland
Elevation: 150–2500 m.
Bioregional distribution: High Sierra Nevada, Tehachapi Mountain Area, Outer South Coast Ranges, Western Transverse Ranges, East of Sierra Nevada, Desert Mountains
Distribution outside California: to s Oregon, Utah, n Arizona
Yellow-green plants have been called subsp. gnaphalodes (Greene) H.M. Hall & Clem. Ssp. viscosus D.D. Keck is hybrid, subsp. h. X Ericameria cuneata
Horticultural information: TRY.

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bioregional map for CHRYSOTHAMNUS%20nauseosus%20subsp.%20hololeucus being generated
 
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Retrieve Jepson Interchange Index to Plant Names entry for Chrysothamnus nauseosus subsp. hololeucus
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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