Solidago latissimifolia is a perennial herb 1-3 m tall, (NYS S1, E), colonial from long, creeping rhizomes; stems stout, mostly hairless, except in inflorescence.
Leaves alternate, stalkless, few or no basal leaves, blade elliptic, 6-15 cm long, 1.5-3.5 cm wide, rather smooth, margins toothed on lower leaves, upper leaves often untoothed, veins pinnate, (not 3-veined).
Flowers yellow, of two types in small heads, rays 6-10, to 0.1 cm wide, disk flowers 4-7, 0.4-0.5 cm long, bracteate base of head 0.4-0.6 cm tall, bracts straw-color with translucent midrib; Inflorescence pyramid-shaped, leafy, branched from a central axis at top of stem, flowers along one side of branch, blooms Sept.-Oct (Hough 1983).
Fruit dry achenes hairy, nearly 0.2 cm long, plume 0.3-05 cm.
Wetland status: OBL.
Frequency in NYC: Very infrequent.
Habitat: Freshwater or brackish swamps along coast.