Isocoma pluriflora

(Torrey & A. Gray) Greene
Erythea 2: 111. 1894.
Common names: Southern jimmyweed
Illustrated
Basionym: Linosyris pluriflora Torrey & A. Gray Fl. N. Amer. 2: 233. 1842
Synonyms: Haplopappus heterophyllus (A. Gray) S. F. Blake Haplopappus pluriflorus (Torrey & A. Gray) H. M. Hall Isocoma wrightii (A. Gray) Rydberg
Treatment appears in FNA Volume 20. Treatment on page 445. Mentioned on page 440.

Herbage usually glabrous or sparsely hispidulous, sometimes densely hirtellous, leaves sometimes stipitate-glandular, never resinous. Leaf blades oblanceolate to narrowly oblong-oblanceolate or nearly linear, mostly 10–40(–50) mm, margins usually entire (hispidulous-cilate, sometimes also on faces), sometimes shallowly toothed distally (especially along western margin of range; teeth in 1(–3) pairs). Involucres 3.2–5.5 × 2.5–4 mm. Phyllary apices yellowish, or if green, then margins scarious, not aristate, gland-dotted, without resin pockets. Florets (8–)11–17(–21); corollas 5–6 mm. Cypsela ribs not forming hornlike extensions. 2n = 12, 24.


Phenology: Flowering (Apr–)Jul–Oct.
Habitat: Igneous or calcareous substrates, sometimes over gypsum, sandy or clay loam, commonly with Larrea-Prosopis
Elevation: 400–1400(–1600) m

Distribution

V20-1022-distribution-map.gif

Ariz., N.Mex., Tex., Mexico (Chihuahua, Coahuila).

Discussion

Like other species of Isocoma, I. pluriflora usually is gland-dotted, but scattered plants are stipitate-glandular.

Selected References

None.

Lower Taxa

None.

... more about "Isocoma pluriflora"
Guy L. Nesom +
(Torrey & A. Gray) Greene +
Linosyris pluriflora +
Southern jimmyweed +
Ariz. +, N.Mex. +, Tex. +, Mexico (Chihuahua +  and Coahuila). +
400–1400(–1600) m +
Igneous or calcareous substrates, sometimes over gypsum, sandy or clay loam, commonly with Larrea-Prosopis +
Flowering (Apr–)Jul–Oct. +
Illustrated +
Haplopappus heterophyllus +, Haplopappus pluriflorus +  and Isocoma wrightii +
Isocoma pluriflora +
species +