Chrysothamnus stylosus

(Eastwood) Urbatsch

Sida 21: 1627. 2005

Common names: Resinbush
Basionyms: Grindelia stylosa Eastwood Proc. Calif. Acad. Sci., ser. 2, 6: 293. 1896
Synonyms: Vanclevea stylosa (Eastwood) Greene
Treatment appears in FNA Volume 20. Treatment on page 190. Mentioned on page 188, 191.

Shrubs, 40–120 cm; with woody, freely branched caudices (not readily differentiated from young shoots). Stems green when young, soon becoming tan to white or grayish with age (bark of older stems flaky), branched, resinous when young, less so with age. Leaves ascending to spreading, becoming deflexed; sessile; blades with conspicuous midnerves plus 1–2 pairs of collaterals often evident, lanceolate to linear-elliptic, falcate, 6–35(–60) × 1–9 mm, often folded, margins sometimes undulate, apices acute, mucronate, ± spinulose, faces glabrous, ± gland-dotted, resinous. Heads usually in dense, cymiform arrays (to 7 cm wide), rarely borne singly, not overtopped by distal leaves. Involucres hemispheric, 8–12 × 9–15 mm. Phyllaries 40–60+ in 3–5 series, in spirals, mostly tan, ovate to lanceolate, unequal, 3–10 × 1–1.8 mm, greenish distally but scarcely herbaceous, apices acute or acuminate, often recurved, faces often glutinous. Disc florets 30–40+; corollas 6–8.5 mm, lobes 1–1.7 mm; style branches 2.8–3.5, appendages 1.3–1.7 mm. Cypselae tan, narrowly cylindric, 4–5 mm, glabrous or sparsely hairy, resinous; pappi of 12–15, white or stramineous, lanceolate to lance-linear scales 2–4 mm. 2n = 18.


Phenology: Flowering summer–fall.
Habitat: Canyonlands, dunes, in sandy soils, with 4-winged saltbush, ephedra, sand dropseed, blackbrush, and juniper
Elevation: 1100–1700 m

Discussion

Chrysothamnus stylosus has been treated previously in the monotypic genus Vanclevea.

Selected References

None.

Lower Taxa

None.

... more about "Chrysothamnus stylosus"
Lowell E. Urbatsch +, Roland P. Roberts +  and Kurt M. Neubig +
(Eastwood) Urbatsch +
Grindelia stylosa +
Resinbush +
Ariz. +  and Utah. +
1100–1700 m +
Canyonlands, dunes, in sandy soils, with 4-winged saltbush, ephedra, sand dropseed, blackbrush, and juniper +
Flowering summer–fall. +
Vanclevea stylosa +
Chrysothamnus stylosus +
Chrysothamnus +
species +