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Grand Canyon glowweed or evening-daisy

pintwater rabbitbrush

Habit Shrubs, 30–100 cm; with woody, ± wandlike, branched caudices, bark tan to gray, fairly smooth, flaky with age. Subshrubs, 10–30 cm; with woody, highly branched caudices, bark whitish to dark gray, finely ridged, ± fibrous with age.
Stems

ascending, green, becoming tan, glabrous or puberulent.

erect, green becoming whitish, glabrous, ± 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;

petiolate;

blades mostly 3-nerved (nerves reticulate, raised), elliptic to oblanceolate or obovate, 20–80 × (7–)10–25 mm (mostly larger basally, ± reduced distally), flat, apices acute, faces glabrous, gland-dotted.

Involucres

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

cylindric to turbinate, 6.5–8.8 × 1.8–2.5 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(–6);

corollas 4–5 mm, lobes 0.8–1.2 mm;

style branches 2.2–2.7 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.

19–24(–30) in 3–4 series, in vertical ranks, tan with apical green spot, midnerves evident distally, ovate to lanceolate, 1.5–6 × 0.7–1.5 mm, unequal, chartaceous, apices obtuse to acuminate, flat, faces glabrous.

Heads

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

in condensed, cymiform arrays, not overtopped by leaves.

Cypselae

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

pappi tan, 6–7.5 mm.

cylindric, 2.5–3 mm, faces hairy;

pappi tan, 3.1–3.9 mm.

2n

= 18 (as Haplopappus scopulorum).

= 18.

Chrysothamnus scopulorum

Chrysothamnus eremobius

Phenology Flowering late summer–fall. Flowering late summer–fall.
Habitat Brushy mountain slopes, ponderosa pine communities Crevices of limestone cliffs
Elevation 1200–2200 m (3900–7200 ft) 1400–1700 m (4600–5600 ft)
Distribution
from FNA
AZ; UT
[BONAP county map]
from FNA
NV
[BONAP county map]
Discussion

Of conservation concern.

Chrysothamnus eremobius is known only from the Pintwater and Sheep ranges of southern Nevada.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 20, p. 190. FNA vol. 20, p. 189.
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. greenei, C. humilis, C. molestus, C. scopulorum, C. stylosus, C. vaseyi, C. viscidiflorus
Synonyms Bigelowia menziesii var. scopulorum, Haplopappus scopulorum, Haplopappus scopulorum var. hirtellus, Hesperodoria scopulorum
Name authority (M. E. Jones) Urbatsch: Sida 21: 1626. (2005) L. C. Anderson: Brittonia 35: 23, fig. 1. (1983)
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