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FNA | Family List | FNA Vol. 20 | Asteraceae | Isocoma

9. Isocoma pluriflora (Torrey & A. Gray) Greene, Erythea. 2: 111. 1894.

Southern jimmyweed

Linosyris pluriflora Torrey & A. Gray, Fl. N. Amer. 2: 233. 1842; Haplopappus heterophyllus (A. Gray) S. F. Blake; H. pluriflorus (Torrey & A. Gray) H. M. Hall; Isocoma wrightii (A. Gray) Rydberg

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.

Flowering (Apr–)Jul–Oct. Igneous or calcareous substrates, sometimes over gypsum, sandy or clay loam, commonly with Larrea-Prosopis; 400–1400(–1600) m; Ariz., N.Mex., Tex.; Mexico (Chihuahua, Coahuila).

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


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