Chrysothamnus depressus |
Chrysothamnus eremobius |
|
---|---|---|
dwarf rabbitbrush, long-flower rabbitbrush, low rabbitbrush |
pintwater rabbitbrush |
|
Habit | Shrubs, 10–50 cm; woody, highly branched caudices, proximal branches decumbent, bark tan to gray, flaky with age. | Subshrubs, 10–30 cm; with woody, highly branched caudices, bark whitish to dark gray, finely ridged, ± fibrous with age. |
Stems | green, becoming whitish tan, ± ridged from leaf bases, densely puberulent. |
erect, green becoming whitish, glabrous, ± resinous. |
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; 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 | obconic, 9–15 × 3–5 mm. |
cylindric to turbinate, 6.5–8.8 × 1.8–2.5 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. |
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 | 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. |
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, not overtopped by distal leaves. |
in condensed, cymiform arrays, not overtopped by leaves. |
Cypselae | tan, subcylindric (tapering proximally), ± flattened, 5–6.5 mm, faces glabrous, sparsely glandular distally; pappi whitish tan, 5.5–7.5 mm. |
cylindric, 2.5–3 mm, faces hairy; pappi tan, 3.1–3.9 mm. |
2n | = 18. |
= 18. |
Chrysothamnus depressus |
Chrysothamnus eremobius |
|
Phenology | Flowering late summer–fall. | Flowering late summer–fall. |
Habitat | Dry canyons and rocky crevices | Crevices of limestone cliffs |
Elevation | 1000–2700 m (3300–8900 ft) | 1400–1700 m (4600–5600 ft) |
Distribution |
AZ; CA; CO; NM; NV; UT
|
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 | ||
Name authority | Nuttall: Proc. Acad. Nat. Sci. Philadelphia 4: 19. (1848) | L. C. Anderson: Brittonia 35: 23, fig. 1. (1983) |
Web links |