Isocoma tenuisecta
Isocoma arguta
burrow goldenweed, burroweed, shrine jimmyweed
Carquinez goldenbush, Contra Costa jimmyweed, Suisun goldenbush
minutely hispidulous to hirtellous or sparsely puberulous (at least distal stems), not resinous.
glabrous or minutely hispidulous, stipitate-glandular.
blades oblong-oblanceolate, 20–35 mm, margins pinnatifid (lobes spreading at right angles, linear to filiform).
blades oblong-obovate, 10–25 mm, margins serrate to lobed (teeth or lobes in 3–5 even pairs, spinulose-aristate).
4–6.5 × 2–2.8 mm.
5–7 × 4–5 mm.
8–12(–15);
corollas 4.5–6 mm.
10–13;
corollas 4–5 mm.
apices with small, sharply delimited, green resinous area, not aristate, often distinctly thickened and approaching resin pockets, usually gland-dotted.
apices greenish, spinulose-aristate, densely and promently gland-dotted, glands often coalesced as small resin pockets.
ribs not forming hornlike extensions.
ribs not forming apical horns.
Isocoma tenuisecta
Isocoma arguta
Some plants approach Isocoma acradenia var. acradenia in leaf and phyllary morphology in southern Arizona, where the ranges of the two taxa overlap.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Of conservation concern.
Isocoma arguta is known only from Contra Costa and Solano counties.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
WildflowerSearch
iNaturalist
USDA Plants Database
CA
