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dwarf rabbitbrush, long-flower rabbitbrush, low rabbitbrush

Grand Canyon glowweed or evening-daisy

Habit Shrubs, 10–50 cm; woody, highly branched caudices, proximal branches decumbent, bark tan to gray, flaky with age. Shrubs, 30–100 cm; with woody, ± wandlike, branched caudices, bark tan to gray, fairly smooth, flaky with age.
Stems

green, becoming whitish tan, ± ridged from leaf bases, densely puberulent.

ascending, green, becoming tan, glabrous or puberulent.

Leaves

erect or closely ascending;

sessile;

blades with evident midnerves, linear to oblanceolate or narrowly oblong, 7–30 × 1.5–7 mm, flat to keeled, apices acute (often apiculate), faces glabrous or puberulent, sometimes sparsely stipitate-glandular.

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.

Involucres

obconic, 9–15 × 3–5 mm.

obconic to subcylindric, 6.5–12 × 3–5 mm.

Disc florets

5–6;

corollas 7–11 mm, lobes 1–2.1 mm;

style branches 2.4–3.3 mm, appendages 1.5–2 mm.

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.

Phyllaries

20–25 in 4–6 series, in 5 strong vertical ranks, tan, often with green and/or purplish markings, midnerves evident throughout and ± expanded apically, lanceolate to elliptic, 3–8 × 0.5–1.5 mm, unequal, outer often herbaceous, inner scarious, strongly keeled, apices acute to acuminate, flat, faces puberulent.

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.

Heads

in densely cymiform arrays, not overtopped by distal leaves.

in usually cymiform to corymbiform, rarely racemiform arrays, not overtopped by distal leaves.

Cypselae

tan, subcylindric (tapering proximally), ± flattened, 5–6.5 mm, faces glabrous, sparsely glandular distally;

pappi whitish tan, 5.5–7.5 mm.

reddish brown, cylindric, 4–6 mm, ± 4-angled, faces hairy;

pappi tan, 6–7.5 mm.

2n

= 18.

= 18 (as Haplopappus scopulorum).

Chrysothamnus depressus

Chrysothamnus scopulorum

Phenology Flowering late summer–fall. Flowering late summer–fall.
Habitat Dry canyons and rocky crevices Brushy mountain slopes, ponderosa pine communities
Elevation 1000–2700 m (3300–8900 ft) 1200–2200 m (3900–7200 ft)
Distribution
from FNA
AZ; CA; CO; NM; NV; UT
[WildflowerSearch map]
[BONAP county map]
from FNA
AZ; UT
[BONAP county map]
Source FNA vol. 20, p. 189. FNA vol. 20, p. 190.
Parent taxa Asteraceae > tribe Astereae > Chrysothamnus Asteraceae > tribe Astereae > Chrysothamnus
Sibling taxa
C. eremobius, C. greenei, C. humilis, C. molestus, C. scopulorum, C. stylosus, C. vaseyi, C. viscidiflorus
C. depressus, C. eremobius, C. greenei, C. humilis, C. molestus, C. stylosus, C. vaseyi, C. viscidiflorus
Synonyms Bigelowia menziesii var. scopulorum, Haplopappus scopulorum, Haplopappus scopulorum var. hirtellus, Hesperodoria scopulorum
Name authority Nuttall: Proc. Acad. Nat. Sci. Philadelphia 4: 19. (1848) (M. E. Jones) Urbatsch: Sida 21: 1626. (2005)
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