Dumb-nettle, potato weed, gallant soldiers, galinsoga
Propagule or dispersal unit is the fruit with pappus. Fertile part 1.2-2 mm long, 0.4-0.7 mm wide, in side view widest in upper part (obovoid), +/- straight, the upper (apical) end narrowing or suddenly cut off (truncate), in cross-section angular (prismatic), basal scar (carpopodium) pronounced and well-differentiated, central or off to the side (oblique) or at least asymmetric, beak (=thinner sterile stalk between seed and pappus) absent, wings absent, fruit surface black, smooth (except at cellular level), with simple straight hairs, thickened margin absent, longitudinal ribs absent.
Pappus type scales, pappus elements all +/- similar, up to 0.9-1.6 mm long, in several rows, pappus elements numerous, persistent, the individual scales dissected.
Annual herb, seeds wind-dispersed. Temperate regions. Tolerant of various soil and light conditions but prefers moist soil; found in croplands, wastegrounds, and urban areas.
South America.
Cosmopolitan