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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
from FNA
AZ; UT
[BONAP county map]
from FNA
CO; NM; NV; UT; WY
[BONAP county map]
Source FNA vol. 20, p. 190. FNA vol. 20, p. 191.
Parent taxa Asteraceae > tribe Astereae > Chrysothamnus Asteraceae > tribe Astereae > Chrysothamnus
Sibling taxa
C. depressus, C. eremobius, C. greenei, C. humilis, C. molestus, C. stylosus, C. vaseyi, C. viscidiflorus
C. depressus, C. eremobius, C. greenei, C. humilis, C. molestus, C. scopulorum, C. stylosus, C. viscidiflorus
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)
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