Ericameria nana |
Ericameria paniculata |
|
---|---|---|
dwarf goldenbush, low goldenbush, rubber weed |
black-banded rabbitbrush, Mojave rabbitbrush, punctate rabbitbrush |
|
Habit | Plants 5–50 cm. | Plants 50–200 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, often black-banded or splotched (from fungal infections), fastigiately branched, glabrous, gland-dotted, 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; blades filiform (adaxially sulcate), 10–35 × 0.5–1.5 mm, midnerves obscure, apices apiculate, faces glabrous, gland-dotted (in circular, deep pits), resinous; axillary fascicles usually absent. |
Peduncles | 0.2–5 mm (mostly ebracteate, glabrous). |
2–12 mm (bracts 0–10, leaflike). |
Involucres | obconic, 5.5–7.5 × 2.5–4 mm. |
subcylindric, 5.5–9 × 3.5–7 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. |
5–8; corollas 5–7 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. |
13–20 in 3–5 series, tan, lanceolate to elliptic, 1–5 × 0.5–1.7 mm, unequal, mostly chartaceous, membranous, midnerves not or slightly raised, faint on distal 1/2, (margins entire, sometimes ciliate distally) apices erect, acute to rounded, apiculate, abaxial faces glabrous, ± resinous. |
Heads | in congested, cymiform arrays (0.5–2.5 cm wide). |
in paniculiform arrays (5–50 mm wide). |
Cypselae | tan, narrowly oblanceoloid, 4–5.5 mm, glabrous or densely sericeous; pappi tan, 4–5.5 mm. |
tan to brown, narrowly elliptic to oblanceoloid, 3.5–4.5 mm (ribs ca. 5), sericeous; pappi off-white to brown, 5.5–6.5 mm. |
2n | = 18. |
= 18. |
Ericameria nana |
Ericameria paniculata |
|
Phenology | Flowering summer–fall. | Flowering late summer–fall. |
Habitat | Arid rocky plains, desert mountain cliffs, crevices | Stony open deserts and washes |
Elevation | 1300–2900 m (4300–9500 ft) | 400–1600 m (1300–5200 ft) |
Distribution |
CA; ID; MT; NV; OR; UT
|
AZ; CA; NV; UT
|
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. 71. |
Parent taxa | Asteraceae > tribe Astereae > Ericameria | Asteraceae > tribe Astereae > Ericameria |
Sibling taxa | ||
Synonyms | Haplopappus nanus | Bigelowia paniculata, Chrysothamnus paniculatus |
Name authority | Nuttall: Trans. Amer. Philos. Soc., n. s. 7: 319. (1840) | (A. Gray) Rydberg: Fl. Rocky Mts., 1066. (1917) |
Web links |