Ericameria nana |
Ericameria linearis |
|
---|---|---|
dwarf goldenbush, low goldenbush, rubber weed |
linear-leaf discoid gumweed, Wyoming goldenbush |
|
Habit | Plants 5–50 cm. | Plants 10–40 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 spreading, green when young, becoming brown, branched proximally, densely floccose-tomentose, eglandular. |
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. |
ascending; blades linear (adaxially sulcate), 10–30 × 1–2 mm, midnerves evident, apices acute, faces mostly densely tomentose, stipitate-glandular; sometimes with axillary leaf fascicles. |
Peduncles | 0.2–5 mm (mostly ebracteate, glabrous). |
2–20 mm (usually leafy). |
Involucres | obconic, 5.5–7.5 × 2.5–4 mm. |
obconic, 9–11 × 6–9 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. |
10–22; corollas 9–11 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. |
20–30 in 2–3 series, green to tan, oblong to lanceolate, 5–10 × 0.8–1.5 mm, subequal, mostly chartaceous, outer herbaceous or herbaceous-tipped, midnerves usually evident, apices acute to acuminate, abaxial faces hairy, stipitate-glandular. |
Heads | in congested, cymiform arrays (0.5–2.5 cm wide). |
borne singly or in cymiform arrays. |
Cypselae | tan, narrowly oblanceoloid, 4–5.5 mm, glabrous or densely sericeous; pappi tan, 4–5.5 mm. |
brownish, narrowly oblong, 5–6 mm, densely hairy; pappi tan, 8–10 mm. |
2n | = 18. |
|
Ericameria nana |
Ericameria linearis |
|
Phenology | Flowering summer–fall. | Flowering late summer–fall. |
Habitat | Arid rocky plains, desert mountain cliffs, crevices | Dry, stony slopes |
Elevation | 1300–2900 m (4300–9500 ft) | ca. 2300 m (ca. 7500 ft) |
Distribution |
CA; ID; MT; NV; OR; UT
|
MT; WY |
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. 61. |
Parent taxa | Asteraceae > tribe Astereae > Ericameria | Asteraceae > tribe Astereae > Ericameria |
Sibling taxa | ||
Synonyms | Haplopappus nanus | Macronema lineare, E. discoidea var. linearis, Haplopappus macronema subsp. linearis, Haplopappus macronema var. linearis |
Name authority | Nuttall: Trans. Amer. Philos. Soc., n. s. 7: 319. (1840) | (Rydberg) R. P. Roberts & Urbatsch: Sida 21: 1560. (2005) |
Web links |