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

2. Isocoma arguta Greene, Man. Bot. San Francisco. 175. 1894.

Contra Costa jimmyweed , Carquinez or suisun goldenbush

Haplopappus venetus (Kunth) S. F. Blake var. argutus (Greene) D. D. Keck

Herbage glabrous or minutely hispidulous, stipitate-glandular. Leaf blades oblong-obovate, 10–25 mm, margins serrate to lobed (teeth or lobes in 3–5 even pairs, spinulose-aristate). Involucres 5–7 × 4–5 mm. Phyllary apices greenish, spinulose-aristate, densely and promently gland-dotted, glands often coalesced as small resin pockets. Florets 10–13; corollas 4–5 mm. Cypsela ribs not forming apical horns.

Flowering Aug–Oct. Low hills, alkaline and subsaline plains, alkali marshes, stream benches, grasslands, fencelines; of conservation concern; 0–20(–50) m; Calif.

Isocoma arguta is known only from Contra Costa and Solano counties.


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