Chrysothamnus depressus |
Chrysothamnus humilis |
|
---|---|---|
dwarf rabbitbrush, long-flower rabbitbrush, low rabbitbrush |
Truckee green rabbitbrush, Truckee rabbitbrush |
|
Habit | Shrubs, 10–50 cm; woody, highly branched caudices, proximal branches decumbent, bark tan to gray, flaky with age. | Shrubs, 10–30 cm; with woody, branched caudices, bark becoming dark gray, fibrous with age. |
Stems | green, becoming whitish tan, ± ridged from leaf bases, densely puberulent. |
ascending, green, sparsely to densely puberulent, sparsely glandular. |
Leaves | erect or closely ascending; sessile; blades with evident midnerves, linear to oblanceolate or narrowly oblong, 7–30 × 1.5–7 mm, flat to keeled, apices acute (often apiculate), faces glabrous or puberulent, sometimes sparsely stipitate-glandular. |
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. |
Involucres | obconic, 9–15 × 3–5 mm. |
turbinate, 6–10 × 3–4 mm. |
Disc florets | 5–6; corollas 7–11 mm, lobes 1–2.1 mm; style branches 2.4–3.3 mm, appendages 1.5–2 mm. |
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). |
Phyllaries | 20–25 in 4–6 series, in 5 strong vertical ranks, tan, often with green and/or purplish markings, midnerves evident throughout and ± expanded apically, lanceolate to elliptic, 3–8 × 0.5–1.5 mm, unequal, outer often herbaceous, inner scarious, strongly keeled, apices acute to acuminate, flat, faces puberulent. |
(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. |
Heads | in densely cymiform arrays, not overtopped by distal leaves. |
in densely cymiform arrays, often overtopped by distal leaves. |
Cypselae | tan, subcylindric (tapering proximally), ± flattened, 5–6.5 mm, faces glabrous, sparsely glandular distally; pappi whitish tan, 5.5–7.5 mm. |
reddish brown, turbinate, 4–6 mm, densely hairy; pappi tan, 5–7 mm. |
2n | = 18. |
= 18. |
Chrysothamnus depressus |
Chrysothamnus humilis |
|
Phenology | Flowering late summer–fall. | Flowering summer–fall. |
Habitat | Dry canyons and rocky crevices | Sagebrush grasslands, open slopes in deserts, tolerant of alkali |
Elevation | 1000–2700 m (3300–8900 ft) | 1400–3100 m (4600–10200 ft) |
Distribution |
AZ; CA; CO; NM; NV; UT
|
CA; ID; NV; OR; WA
|
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 | Nuttall: Proc. Acad. Nat. Sci. Philadelphia 4: 19. (1848) | Greene: Pittonia 3: 24. (1896) |
Web links |