Alkali Goldenbush

Isocoma acradenia is distinctive in its whitish stems and narrow, whitish-indurate phyllaries with an apical resin pocket (or pockets). The leaves often occur in axillary fascicles.

Varieties 3 (3 in the flora): sw United States, nw Mexico.

Herbage usually glabrous, sometimes minutely hispidulous, often stipitate-glandular, often resinous. Leaf blades oblanceolate to narrowly obovate, 20–150 mm, margins entire or toothed or lobed (teeth or lobes apically rounded-obtuse). Involucres 5–8 × 5–7 mm. Phyllary apices yellowish to greenish yellow, sometimes spinulose-aristate, usually not gland-dotted, usually with single, strongly developed, subepidermal resin pocket nearly as wide as bracts, sometimes a central pocket and 2+ smaller, lateral ones (resin pockets sometimes formed from numerous, coalesced, sessile glands). Florets 12–27; corollas 5–7(–8) mm. Cypsela ribs not forming apical horns.

Bigelowia acradenia Greene, Bull. Torrey Bot. Club 10: 126. 1883 (as Bigelovia); Haplopappus acradenius (Greene) S. F. Blake