General:
Annual herb from a fibrous root; stems branched, appressed-hairy with some long, spreading hairs and sometimes some glandular hairs, 15-60 cm tall.

Leaves:
Basal leaves lacking; stem leaves opposite, simple, stalked, narrowly egg-shaped, toothed, rarely entire, mostly glabrous, 3-5.5 cm long, 0.5-2.5 cm wide.

Flowers:
Heads with ray and disk flowers, numerous in leafy-bracted clusters, the bases sparsely hairy; involucres 2-3 mm tall; involucral bracts egg-shaped; receptacles conic, covered with narrow, membranous scales; ray flowers white, about 1 mm long; disk flowers yellow, shorter than the pappus scales.

Fruits:
Achenes black, those of the ray flowers compressed, sparsely short-hairy; pappus of the ray flowers minute or lacking, those of the disk flowers slightly angled, sparsely short-hairy, of 9-18 rounded or blunt, white scales with finely-or densely-fringed margins.

Source:  The Illustrated Flora of British Columbia

If more than one illustration is available for a species (e.g., separate illustrations were provided for two subspecies) then links to the separate images will be provided below. Note that individual subspecies or varietal illustrations are not always available.

Illustration Source:  The Illustrated Flora of British Columbia

Synonyms and Alternate Names:
Galinsoga parviflora var. semicalva Gray
Galinsoga semicalva (Gray) St. John & White
Galinsoga semicalva var. percalva Blake