Isocoma arguta

Greene

Man. Bot. San Francisco,175. 1894

Common names: Contra Costa jimmyweed Carquinez or suisun goldenbush
Synonyms: Haplopappus venetus argutus
Found in FNA Volume 20. Treatment on page 442. Mentioned on page 440.
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.

Phenology: Flowering Aug–Oct.
Habitat: Low hills, alkaline and subsaline plains, alkali marshes, stream benches, grasslands, fencelines
Elevation: 0–20(–50) m

Distribution

Calif.

Discussion

Of conservation concern.

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

References

None.

Facts about "Isocoma arguta"
AuthorGuy L. Nesom +
Common nameContra Costa jimmyweed + and Carquinez or suisun goldenbush +
Elevation0–20(–50) m +
HabitatLow hills, alkaline and subsaline plains, alkali marshes, stream benches, grasslands, fencelines +
IllustratorBarbara Alongi +
PhenologyFlowering Aug–Oct. +
ReferenceNone +
SynonymHaplopappus venetus argutus +
Taxon nameIsocoma arguta +
Taxon parentIsocoma +
Taxon rankspecies +
VolumeVolume 20 +