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

10. Isocoma tenuisecta Greene, Leafl. Bot. Observ. Crit. 1: 169. 1906.

Shrine jimmyweed , burroweed

Haplopappus tenuisectus (Greene) S. F. Blake ex L. D. Benson

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.

Flowering Sep–Nov. Sandy or gravelly flats and hills, grasslands, usually matorral or Larrea stands; 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.


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