Chrysothamnus molestus

(S. F. Blake) L. C. Anderson

Madroño 17: 222. 1964.

Common names: Arizona rabbitbrush
Basionym: Chrysothamnus viscidiflorus var. molestus S. F. Blake J. Wash. Acad. Sci. 30: 468. 1940
Treatment appears in FNA Volume 20. Treatment on page 190. Mentioned on page 101, 188.

Shrubs, 8–20 cm; with woody, highly branched caudices, bark dark gray, highly fibrous with age. Stems ascending, green, ± puberulent, stipitate-glandular. Leaves 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. Heads in small cymiform to racemiform arrays. Involucres subcylindric, 9–11 × 2.5–3.5 mm. Phyllaries ± 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. Disc florets 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. Cypselae tan, elliptic, 4.2–6 mm, mostly 5-ribbed, faces glabrous, sparsely glandular; pappi tan, 6–7.5 mm. 2n = 18.

Phenology: Flowering late summer–fall.
Habitat: Rocky soils, mostly on limestone pinyon-juniper woodland
Elevation: 1800–2400 m


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

Selected References


Lower Taxa

... more about "Chrysothamnus molestus"
Lowell E. Urbatsch +, Roland P. Roberts +  and Kurt M. Neubig +
(S. F. Blake) L. C. Anderson +
Chrysothamnus viscidiflorus var. molestus +
Arizona rabbitbrush +
1800–2400 m +
Rocky soils, mostly on limestone pinyon-juniper woodland +
Flowering late summer–fall. +
Illustrated +  and Endemic +
Vanclevea +
Chrysothamnus molestus +
Chrysothamnus +
species +