The green links below add additional plants to the comparison table. Blue links lead to other Web sites.
enable glossary links

Truckee green rabbitbrush, Truckee rabbitbrush

Arizona rabbitbrush

Habit Shrubs, 10–30 cm; with woody, branched caudices, bark becoming dark gray, fibrous with age. Shrubs, 8–20 cm; with woody, highly branched caudices, bark dark gray, highly fibrous with age.
Stems

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

ascending, green, ± puberulent, stipitate-glandular.

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.

erect to closely ascending;

sessile;

blades with ± evident midnerves, linear to narrowly elliptic, 7–20 × 0.7–1.5 mm, sulcate, sometimes apiculate, apices acute, faces moderately puberulent, uniformly stipitate-glandular.

Involucres

turbinate, 6–10 × 3–4 mm.

subcylindric, 9–11 × 2.5–3.5 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;

corollas 5.5–7.5 mm, lobes 0.9–1.5 mm;

style branches 2.7–3.2 mm, appendages 1–1.7 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.

± 20 in 4–5 series, in 4–5 strong vertical ranks, tan, often with green or dark subapical splotch, midnerves often obscure, linear or lanceolate to elliptic, 2–9 × 0.5–1.3 mm, unequal, outer ± herbaceous, inner chartaceous, strongly keeled, apices acute to rounded, tip cupped, faces of outer glabrous or puberulent.

Heads

in densely cymiform arrays, often overtopped by distal leaves.

in small cymiform to racemiform arrays.

Cypselae

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

pappi tan, 5–7 mm.

tan, elliptic, 4.2–6 mm, mostly 5-ribbed, faces glabrous, sparsely glandular;

pappi tan, 6–7.5 mm.

2n

= 18.

= 18.

Chrysothamnus humilis

Chrysothamnus molestus

Phenology Flowering summer–fall. Flowering late summer–fall.
Habitat Sagebrush grasslands, open slopes in deserts, tolerant of alkali Rocky soils, mostly on limestone pinyon-juniper woodland
Elevation 1400–3100 m (4600–10200 ft) 1800–2400 m (5900–7900 ft)
Distribution
from FNA
CA; ID; NV; OR; WA
[WildflowerSearch map]
[BONAP county map]
from FNA
AZ
[BONAP county map]
Discussion

Chrysothamnus molestus is known only from Coconino County. It is in the Center for Plant Conservation’s National Collection of Endangered Plants.

(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. eremobius, C. greenei, C. molestus, C. scopulorum, C. stylosus, C. vaseyi, C. viscidiflorus
C. depressus, C. eremobius, C. greenei, C. humilis, C. scopulorum, C. stylosus, C. vaseyi, C. viscidiflorus
Synonyms C. viscidiflorus subsp. humilis C. viscidiflorus var. molestus
Name authority Greene: Pittonia 3: 24. (1896) (S. F. Blake) L. C. Anderson: Madroño 17: 222. (1964)
Web links