Flower:

Flowers are at the end of smooth or short-hairy stalks arising from the leaf axils in the upper plant and at the tips of branching stems. Individual flowers are about ¼ inch across with 4 to 8 (usually 5) short, white rays (petals), each notched in 2 or 3 parts, about as wide as long, and typically widely spaced around the center disk. Disk flowers are golden yellow.

Leaves and stems:

Leaves are ¾ to 2½ inches long, ½ to 1½ inches wide, lance to broadly egg-shaped, blunt to pointed at the tip, tapering to rounded at the base, oppositely attached, on stalks up to ½ inch long.

Leaves are mostly shallowly toothed with fine hairs around the edges. Surfaces are mostly hairless except for scattered hairs on the major veins on the underside. Stems are smooth to sparsely hairy, erect to sprawling, and heavily branched.

Fruit:

Both the ray and disk flowers produce a dry seed, with 5 or more narrow scales attached at the tip, each scale fringed around the edges.

Notes:

Likely an under-reported weed, Small-flowered Galinsoga resembles the related Shaggy Soldier (Galinsoga quadriradiata), which is hairier overall, has larger white rays on the flowers that are typically notched in 3 parts, and has a distinct awn at the tip of seed scales. There are 2 recognized varieties of G. parviflora, though they are not universally accepted: var. semicalva has leaves that are narrower and mostly toothless, has more compact flower clusters and is present only known to be in a few southwestern US states, and var. parviflora, described above, found across much of North America, including Minnesota.