Chrysothamnus scopulorum |
Chrysothamnus vaseyi |
|
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Grand Canyon glowweed or evening-daisy |
Vasey's rabbitbrush |
|
Habit | Shrubs, 30–100 cm; with woody, ± wandlike, branched caudices, bark tan to gray, fairly smooth, flaky with age. | Shrubs, 10–30 cm; caudices woody, very branched, bark tan to dark gray, fibrous with age. |
Stems | ascending, green, becoming tan, glabrous or puberulent. |
ascending, green becoming tan, glabrous or puberulent, resin-dotted to resinous. |
Leaves | ascending to spreading; sessile; blades usually 5-nerved, linear to narrowly elliptic or lanceolate, 7–80 × 1–12 mm, flat, margins often ciliolate, apices attenuate to spinulose, faces glabrous or scabrellous. |
ascending to spreading; sessile; blades with faint midnerves, linear to oblanceolate, 10–40 × 1–2.5 mm, flat or sulcate, usually not twisted, margins eciliate or sparsely puberulent, apices acute to apiculate, faces usually glabrous, sometimes puberulent, usually gland-dotted, resinous. |
Involucres | obconic to subcylindric, 6.5–12 × 3–5 mm. |
cylindric to obconic, (5–)6–8 × 2–4 mm. |
Disc florets | 10–16(–20); corollas 5.5–8 mm, lobes 1.5–2.3 mm; style branches 2.8–3.7 mm, appendages 1.4–1.9 mm. |
5–7; corollas 4.5–6.5 mm, lobes 1.2–1.7 mm; style branches 2.5–3.8 mm, appendages 0.8–1.2 mm. |
Phyllaries | 50–60+ in 5–6(–7) series, ± in spirals, tan, midnerves greenish to brown, raised, ± expanded apically, oblong to elliptic, 1–8.5 × 1–2 mm, unequal, mostly chartaceous, apices acute to rounded, erect, ± thickened, faces glabrous, not resinous. |
12–18 in 3–4 series, in weak vertical ranks, mostly tan, greenish apically, midnerves evident and ± expanded distally, ovate to elliptic, unequal, 1.5–7 × 1–1.8 mm, chartaceous, weakly keeled, margins scarious, ciliate to lacerate, apices acute to obtuse-rounded, faces glabrous or gland-dotted. |
Heads | in usually cymiform to corymbiform, rarely racemiform arrays, not overtopped by distal leaves. |
in dense cymiform arrays (to 5 cm wide), sometimes overtopped by distal leaves. |
Cypselae | reddish brown, cylindric, 4–6 mm, ± 4-angled, faces hairy; pappi tan, 6–7.5 mm. |
reddish brown, cylindric to turbinate, 4–5 mm, 5–10-nerved, faces glabrous; pappi tan (fine), 3.5–5 mm. |
2n | = 18 (as Haplopappus scopulorum). |
= 18. |
Chrysothamnus scopulorum |
Chrysothamnus vaseyi |
|
Phenology | Flowering late summer–fall. | Flowering summer–fall. |
Habitat | Brushy mountain slopes, ponderosa pine communities | Open woods (oak or ponderosa pine) and dry meadows |
Elevation | 1200–2200 m (3900–7200 ft) | 1700–2900 m (5600–9500 ft) |
Distribution |
AZ; UT |
CO; NM; NV; UT; WY |
Source | FNA vol. 20, p. 190. | FNA vol. 20, p. 191. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | Bigelowia menziesii var. scopulorum, Haplopappus scopulorum, Haplopappus scopulorum var. hirtellus, Hesperodoria scopulorum | Bigelowia vaseyi |
Name authority | (M. E. Jones) Urbatsch: Sida 21: 1626. (2005) | (A. Gray) Greene: Erythea 3: 96. (1895) |
Web links |