Ericameria discoidea |
Ericameria laricifolia |
|
---|---|---|
discoid goldenweed, rayless goldenbush, sharp-scale goldenweed, white-stem goldenbush |
turpentine bush, turpentine-brush |
|
Habit | Plants 10–40 cm. | Plants 30–100 cm. |
Stems | erect to spreading, abundantly branched, twigs green when young, concealed by whitish, pannose tomentum, sporadically stipitate-glandular. |
erect to ascending, green when young, fastigiately branched, glabrous, gland-dotted, resinous. |
Leaves | ascending to spreading; blades linear or oblong to oblanceolate (flat), 10–35 × 2–7 mm, midnerves evident (1–2 fainter, collateral nerves often present), (margins often undulate) apices acute to obtuse, usually apiculate, faces usually stipitate-glandular, resinous; axillary fascicles absent. |
blades ascending, sometimes spreading when older, filiform to narrowly oblanceolate (adaxially sulcate to concave), 10–20 × 1–2 mm, midnerves not evident, apices acute, sometimes apiculate, faces glabrous, regularly gland-dotted (in circular, deep pits), resinous; axillary leaf fascicles sometimes present, shorter than subtending leaves. |
Peduncles | 3–15 mm (bracts 0–3, reduced, leaflike, whitish tomentose and usually stipitate-glandular). |
3–15 mm (bracts 3–20+, mostly leaflike, distal scalelike). |
Involucres | obconic, 9–13 × 6–10 mm. |
turbinate, 3–5 × 3–5 mm. |
Ray florets | 0. |
3–6; laminae 4–5 × 1–2 mm. |
Disc florets | 10–26; corollas 9–11 mm. |
6–16; corollas 5–6 mm. |
Phyllaries | 12–17 in 2–3 series, green to tan, lanceolate to oblong, 6–10 × 1–2 mm, subequal, outer herbaceous or distally so, inner mostly chartaceous, midnerves evident, (margins of outer often distally stipitate-glandular, of inner narrowly membranous, sometimes minutely ciliolate) apices acute to attenuate, abaxial faces stipitate-glandular. |
12–20 in 3–4 series, tan, linear to lanceolate, 1–3.5 × 0.5–1 mm, unequal, mostly chartaceous, sometimes herbaceous-tipped, erect, midnerves raised, somewhat expanded apically, subapical resin ducts usually present, (margins scarious to narrowly membranous, glabrous or ciliate) apices erect, acute, sometimes apiculate, abaxial faces glabrous. |
Heads | borne singly or in cymiform to racemiform arrays. |
in irregular cymiform arrays (to 7 cm wide). |
Cypselae | brownish, narrowly oblong to narrowly ovoid, 5–6 mm, villous; pappi tan, 8.5–11 mm. |
tan to brown, turbinate to narrowly oblanceolate, 3.5–4 mm (ribs ca. 5), villous; pappi off-white to brown, 3.5–5 mm. |
2n | = 18. |
= 18. |
Ericameria discoidea |
Ericameria laricifolia |
|
Phenology | Flowering late summer–fall. | Flowering fall. |
Habitat | Rocky, open or sparsely wooded slopes, often in coarse talus | Rocky, desert mountains on slopes, mesas, canyons, and rock walls |
Elevation | 2500–3800 m (8200–12500 ft) | 1000–2000 m (3300–6600 ft) |
Distribution |
CA; CO; ID; MT; NV; OR; UT
|
AZ; CA; NM; NV; TX; UT; Mexico (Chihuahua)
|
Discussion | Ericameria discoidea is common in the Rocky Mountains. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
|
Source | FNA vol. 20, p. 58. | FNA vol. 20, p. 60. |
Parent taxa | Asteraceae > tribe Astereae > Ericameria | Asteraceae > tribe Astereae > Ericameria |
Sibling taxa | ||
Synonyms | Macronema discoidea, Haplopappus macronema | Haplopappus laricifolius |
Name authority | (Nuttall) G. L. Nesom: Phytologia 68: 153. (1990) | (A. Gray) Shinners: Field & Lab. 18: 27. (1950) |
Web links |