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pintwater rabbitbrush

Grand Canyon glowweed or evening-daisy

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

erect, green becoming whitish, glabrous, ± resinous.

ascending, green, becoming tan, glabrous or puberulent.

Leaves

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.

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

cylindric to turbinate, 6.5–8.8 × 1.8–2.5 mm.

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

Disc florets

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.

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

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.

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 condensed, cymiform arrays, not overtopped by leaves.

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

Cypselae

cylindric, 2.5–3 mm, faces hairy;

pappi tan, 3.1–3.9 mm.

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

pappi tan, 6–7.5 mm.

2n

= 18.

= 18 (as Haplopappus scopulorum).

Chrysothamnus eremobius

Chrysothamnus scopulorum

Phenology Flowering late summer–fall. Flowering late summer–fall.
Habitat Crevices of limestone cliffs Brushy mountain slopes, ponderosa pine communities
Elevation 1400–1700 m (4600–5600 ft) 1200–2200 m (3900–7200 ft)
Distribution
from FNA
NV
[BONAP county map]
from FNA
AZ; UT
[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. 189. FNA vol. 20, p. 190.
Parent taxa Asteraceae > tribe Astereae > Chrysothamnus Asteraceae > tribe Astereae > Chrysothamnus
Sibling taxa
C. depressus, 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 L. C. Anderson: Brittonia 35: 23, fig. 1. (1983) (M. E. Jones) Urbatsch: Sida 21: 1626. (2005)
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