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Key to families | Table of families and genera

Specimen numbers are hyperlinked to records in the Consortium of California Herbaria data view where possible. Taxa are hyperlinked to entries in the Jepson Interchange via the "[Online Interchange]" link.

 

CHRYSOTHAMNUS RABBITBRUSH

Lowell E. Urbatsch


Subshrub or shrub. Stem: erect to spreading, often highly branched. Leaf: alternate, sessile, entire. Inflorescence: heads discoid, in ± dense cyme-like (raceme-like) clusters, peduncled or ± sessile; involucre generally obconic, cylindric, or hemispheric; phyllaries generally in 3–7 series in ± 5 vertical or spiral ranks, free, overlapping, often keeled, persistent; receptacle convex, pitted, epaleate. Flower: (2)5–6(40+); corolla yellow, lobes 0.5–2.3 mm, generally spreading; anther tips narrowly acute, length 2.5–5.3 × width; style branches long, slender. Fruit: obconic or elliptic to cylindric, 5–10 ridged, generally light brown; pappus of many white to ± brown bristles.
9 species: southwestern Canada, western United States. (Greek: golden shrub) [Urbatsch et al. 2006 FNANM 20:187–193] Other species in TJM (1993) moved to Cuniculotinus, Ericameria.
Unabridged references: [Urbatsch et al. 2005 Sida 21:1615–1632]

Key to Chrysothamnus

1. Involucre 9–15 mm; fruit glabrous or with few glandular hairs; style appendages ± = stigmatic portion ..... C. depressus

1' Involucre 4–10 mm; fruit moderately to densely hairy; style appendages generally < stigmatic portion

2. Heads generally overtopped by distal leaves; flowers 2–3(4); style branches generally not exserted beyond spreading corolla lobes; lower phyllaries leaf-like and >= rest of involucre ..... C. humilis

2' Heads not overtopped by distal leaves (occasionally distal may reach into inflorescence but not beyond); flowers 3–5(14); lower phyllaries ± green but << rest of involucre; style branches exserted beyond spreading corolla lobes.

3. Leaves thread-like, 0.5–2 mm wide; phyllary tips acuminate to rigidly short-pointed; flowers 4–5 ..... C. greenei

3' Leaves thread-like or linear to oblong or (ob)lanceolate, 0.5–10 mm wide; phyllary tips acute to obtuse or rounded; flowers 3–14 ..... C. viscidiflorus

4. Distal stems and often leaves hairy

5. Stem ± green, bristly hairy; leaves green, 2–6 mm wide, rough-hairy especially abaxially, sometimes glabrous adaxially, 3–5-veined ..... subsp. lanceolatus

5' Stem and leaves gray-green, puberulent; leaves 1–2(4) mm wide; 1-veined (sometimes 3-veined proximally) ..... subsp. puberulus

4' Stem glabrous; leaf faces glabrous, margins ± ciliate

6. Leaves 0.5–1 mm wide; flowers 3–4(5); involucre ± obconic ..... subsp. axillaris

6' Leaves 1–10 mm wide; flowers 4–14; involucre narrowly cylindric ..... subsp. viscidiflorus

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Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html [accessed on month, day, year]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].
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