Horseweed (Canada Fleabane, Hog Weed)
A flowering annual with variable height. Large specimens may be densely branched in the top half of the plant. Flowerheads many, in a dense, elongate, terminal inflorescence. Heads tiny, about ³⁄₁₆ inch across, the cream-colored rays so small that they are seen only with a magnifying lens. Blooms June–November. Leaves many, hairy, elongated, alternate around the single, hairy stem.