Leafl. Bot. Observ. Crit. 1: 169. 1906.
Herbage minutely hispidulous to hirtellous or sparsely puberulous (at least distal stems), not resinous. Leaf blades oblong-oblanceolate, 20–35 mm, margins pinnatifid (lobes spreading at right angles, linear to filiform). Involucres 4–6.5 × 2–2.8 mm. Phyllary apices with small, sharply delimited, green resinous area, not aristate, often distinctly thickened and approaching resin pockets, usually gland-dotted. Florets 8–12(–15); corollas 4.5–6 mm. Cypsela ribs not forming hornlike extensions.
Phenology: Flowering Sep–Nov.
Habitat: Sandy or gravelly flats and hills, grasslands, usually matorral or Larrea stands
Elevation: 700–1600 m
Ariz., N.Mex., Mexico (Sonora).
Some plants approach Isocoma acradenia var. acradenia in leaf and phyllary morphology in southern Arizona, where the ranges of the two taxa overlap.