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Truckee green rabbitbrush, Truckee rabbitbrush

pintwater rabbitbrush

Habit Shrubs, 10–30 cm; with woody, branched caudices, bark becoming dark gray, fibrous with age. Subshrubs, 10–30 cm; with woody, highly branched caudices, bark whitish to dark gray, finely ridged, ± fibrous with age.
Stems

ascending, green, sparsely to densely puberulent, sparsely glandular.

erect, green becoming whitish, glabrous, ± resinous.

Leaves

ascending to spreading;

sessile;

blades with faint midnerves and pair of collaterals, narrowly elliptic to oblanceolate, 10–30 × 0.7–1.2 mm, flat to sulcate, apices acute (often apiculate), faces moderately puberulent, sparsely stipitate-glandular.

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

turbinate, 6–10 × 3–4 mm.

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

Disc florets

2–3(–4);

corollas 5.5–8 mm, lobes 1–1.7 mm;

style branches 2–2.7(–3.4) mm (included in or barely surpassing spreading corolla lobes), appendages 0.8–1.4 mm (lengths about equaling stigmatic portion).

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

(12–)14–18 in 3–4 series, ± in vertical ranks, mostly tan, sometimes green-tipped, ovate or oblong to elliptic, unequal, 2.5–7.5 × 1–1.8 mm, chartaceous, outer ± herbaceous wholly or distally, weakly keeled, midveins faint, apices acute to obtuse, faces sparsely puberulent.

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 densely cymiform arrays, often overtopped by distal leaves.

in condensed, cymiform arrays, not overtopped by leaves.

Cypselae

reddish brown, turbinate, 4–6 mm, densely hairy;

pappi tan, 5–7 mm.

cylindric, 2.5–3 mm, faces hairy;

pappi tan, 3.1–3.9 mm.

2n

= 18.

= 18.

Chrysothamnus humilis

Chrysothamnus eremobius

Phenology Flowering summer–fall. Flowering late summer–fall.
Habitat Sagebrush grasslands, open slopes in deserts, tolerant of alkali Crevices of limestone cliffs
Elevation 1400–3100 m (4600–10200 ft) 1400–1700 m (4600–5600 ft)
Distribution
from FNA
CA; ID; NV; OR; WA
[WildflowerSearch map]
[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. 189. FNA vol. 20, p. 189.
Parent taxa Asteraceae > tribe Astereae > Chrysothamnus Asteraceae > tribe Astereae > Chrysothamnus
Sibling taxa
C. depressus, C. eremobius, C. greenei, C. molestus, C. scopulorum, C. stylosus, C. vaseyi, C. viscidiflorus
C. depressus, C. greenei, C. humilis, C. molestus, C. scopulorum, C. stylosus, C. vaseyi, C. viscidiflorus
Synonyms C. viscidiflorus subsp. humilis
Name authority Greene: Pittonia 3: 24. (1896) L. C. Anderson: Brittonia 35: 23, fig. 1. (1983)
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