Ericameria nana |
Ericameria teretifolia |
|
---|---|---|
dwarf goldenbush, low goldenbush, rubber weed |
green or round-leaf rabbitbrush, green rabbitbrush, round-leaf rabbitbrush |
|
Habit | Plants 5–50 cm. | Plants 30–150 cm. |
Stems | erect to spreading or recurved, green when young, soon becoming tan to brown, then nearly black when older, highly branched, twigs glabrous, glandular, usually resinous. |
erect to ascending, green when young, fastigiately branched, gland-dotted (in pits), resinous. |
Leaves | ascending to spreading; blades usually elliptic to oblanceolate, occasionally spatulate, 10–15 × 0.5–1.5 mm, mostly adaxially sulcate, margins entire, midnerves usually obscure to weakly evident, apices acute, apiculate, faces glandular, sometimes irregularly gland-dotted (in shallow pits), resinous; axillary fascicles present, persistent. |
mostly ascending to spreading; blades filiform (adaxially sulcate), 10–35 × 0.5–1.5 mm, midnerves obscure, apices acute to obtuse or rounded, faces glabrous, gland-dotted (in circular, deep pits), resinous. |
Peduncles | 0.2–5 mm (mostly ebracteate, glabrous). |
0.5–2 mm (bracts 0–3, mostly like outer phyllaries). |
Involucres | obconic, 5.5–7.5 × 2.5–4 mm. |
obconic, 5–9 × 2–5 mm. |
Ray florets | 1–7; laminae elliptic, 3–4 × 0.8–1.3 mm. |
0. |
Disc florets | 4–8; corollas 4.5–6.5 mm. |
5–7; corollas 5.8–8 mm. |
Phyllaries | 22–30 in 4–5 series, mostly tan, lanceolate to elliptic, 2–6.5 × 0.5–1.2 mm, strongly unequal, outer sometimes herbaceous or herbaceous-tipped (body apices obtuse or truncate to retuse, appendages erect), midnerves not evident or slightly raised, slightly expanded subapically, (mostly margins narrowly membranous, entire) apices acute to acuminate or attenuate, mid often aristate to cuspidate, abaxial faces glabrous, resinous. |
16–20 in 3–5 series (in vertical ranks), tan, lanceolate to oblong, 1–7 × 0.5–1.5 mm, strongly unequal, mostly chartaceous, midnerves mostly obscure, apices acute to rounded (outer each tipped with subspheric resin-gland), abaxial faces resinous. |
Heads | in congested, cymiform arrays (0.5–2.5 cm wide). |
in cymiform to racemiform arrays (1–3 cm wide). |
Cypselae | tan, narrowly oblanceoloid, 4–5.5 mm, glabrous or densely sericeous; pappi tan, 4–5.5 mm. |
tan to brown, narrowly ellipsoid, 3–4 mm, sericeous; pappi off-white to brown, 6–7.5 mm. |
2n | = 18. |
= 18. |
Ericameria nana |
Ericameria teretifolia |
|
Phenology | Flowering summer–fall. | Flowering fall. |
Habitat | Arid rocky plains, desert mountain cliffs, crevices | Canyon walls, rocky flats, and slopes |
Elevation | 1300–2900 m (4300–9500 ft) | 600–2400 m (2000–7900 ft) |
Distribution |
CA; ID; MT; NV; OR; UT
|
AZ; CA; NV
|
Discussion | Some populations of Ericameria nana exhibit extreme variation in leaf shape and in phyllary apex length and shape. Whether such variants represent distinct taxa remains to be tested. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
|
Source | FNA vol. 20, p. 61. | FNA vol. 20, p. 76. |
Parent taxa | Asteraceae > tribe Astereae > Ericameria | Asteraceae > tribe Astereae > Ericameria |
Sibling taxa | ||
Synonyms | Haplopappus nanus | Linosyris teretifolia, Chrysothamnus teretifolius |
Name authority | Nuttall: Trans. Amer. Philos. Soc., n. s. 7: 319. (1840) | (Durand & Hilgard) Jepson: Man. Fl. Pl. Calif., 1024. (1925) |
Web links |