Galinsoga parviflora Cav.

Erect annual, 10–75 cm tall. Stems glabrous to moderately hairy, usually becoming almost glabrous below, much-branched. Lvs glabrous or sparsely hairy especially on margins and veins of undersurface, petiolate, usually ovate, sometimes elliptic, acute to acuminate, obtuse to truncate at base, serrate, 1–9 cm long; upper cauline lvs usually smaller, narrower, and apetiolate. Capitula 3–7 mm diam., in loose clusters; peduncles 3–20–(35) mm long, sparsely to densely hairy and usually with stalked glandular hairs. Involucral bracts foliaceous, mostly persistent, with narrow to broad membranous laciniate margins. Outer and inner receptacular scales 3-fid, innermost persistent. Ray florets usually 5; ligules white, entire or shallowly (2)–3-fid, 1–1.8 × 1–1.8 mm. Disc florets many, golden yellow. Achenes of ray florets strongly flattened, glabrous or with a few scattered hairs, 1.8–2.5 mm long; pappus 0, or reduced to short, entire or laciniate scales < 0.7 mm long. Achenes of disc florets flattened or square in section, usually hairy especially on angles, 1.5–2 mm long; pappus scales 15–22, 1–1.5 mm long, subulate, laciniate and usually obtuse at apex, sometimes acute to acuminate on innermost achenes.

[From: Webb et al. (1988) Flora of New Zealand. Volume 4.]