Chrysothamnus humilis |
Chrysothamnus eremobius |
|
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Truckee green rabbitbrush, Truckee rabbitbrush |
pintwater rabbitbrush |
|
Habit | Shrubs, 10–30 cm; with woody, branched caudices, bark becoming dark gray, fibrous with age. | Subshrubs, 10–30 cm; with woody, highly branched caudices, bark whitish to dark gray, finely ridged, ± fibrous with age. |
Stems | ascending, green, sparsely to densely puberulent, sparsely glandular. |
erect, green becoming whitish, glabrous, ± resinous. |
Leaves | ascending to spreading; sessile; blades with faint midnerves and pair of collaterals, narrowly elliptic to oblanceolate, 10–30 × 0.7–1.2 mm, flat to sulcate, apices acute (often apiculate), faces moderately puberulent, sparsely stipitate-glandular. |
ascending to spreading; petiolate; blades mostly 3-nerved (nerves reticulate, raised), elliptic to oblanceolate or obovate, 20–80 × (7–)10–25 mm (mostly larger basally, ± reduced distally), flat, apices acute, faces glabrous, gland-dotted. |
Involucres | turbinate, 6–10 × 3–4 mm. |
cylindric to turbinate, 6.5–8.8 × 1.8–2.5 mm. |
Disc florets | 2–3(–4); corollas 5.5–8 mm, lobes 1–1.7 mm; style branches 2–2.7(–3.4) mm (included in or barely surpassing spreading corolla lobes), appendages 0.8–1.4 mm (lengths about equaling stigmatic portion). |
5(–6); corollas 4–5 mm, lobes 0.8–1.2 mm; style branches 2.2–2.7 mm, appendages 0.8–1.2 mm. |
Phyllaries | (12–)14–18 in 3–4 series, ± in vertical ranks, mostly tan, sometimes green-tipped, ovate or oblong to elliptic, unequal, 2.5–7.5 × 1–1.8 mm, chartaceous, outer ± herbaceous wholly or distally, weakly keeled, midveins faint, apices acute to obtuse, faces sparsely puberulent. |
19–24(–30) in 3–4 series, in vertical ranks, tan with apical green spot, midnerves evident distally, ovate to lanceolate, 1.5–6 × 0.7–1.5 mm, unequal, chartaceous, apices obtuse to acuminate, flat, faces glabrous. |
Heads | in densely cymiform arrays, often overtopped by distal leaves. |
in condensed, cymiform arrays, not overtopped by leaves. |
Cypselae | reddish brown, turbinate, 4–6 mm, densely hairy; pappi tan, 5–7 mm. |
cylindric, 2.5–3 mm, faces hairy; pappi tan, 3.1–3.9 mm. |
2n | = 18. |
= 18. |
Chrysothamnus humilis |
Chrysothamnus eremobius |
|
Phenology | Flowering summer–fall. | Flowering late summer–fall. |
Habitat | Sagebrush grasslands, open slopes in deserts, tolerant of alkali | Crevices of limestone cliffs |
Elevation | 1400–3100 m (4600–10200 ft) | 1400–1700 m (4600–5600 ft) |
Distribution |
CA; ID; NV; OR; WA
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NV |
Discussion | Of conservation concern. Chrysothamnus eremobius is known only from the Pintwater and Sheep ranges of southern Nevada. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
|
Source | FNA vol. 20, p. 189. | FNA vol. 20, p. 189. |
Parent taxa | Asteraceae > tribe Astereae > Chrysothamnus | Asteraceae > tribe Astereae > Chrysothamnus |
Sibling taxa | ||
Synonyms | C. viscidiflorus subsp. humilis | |
Name authority | Greene: Pittonia 3: 24. (1896) | L. C. Anderson: Brittonia 35: 23, fig. 1. (1983) |
Web links |