Common goldentop

Euthamia graminifolia, grass-leaved goldentop or flat-topped goldenrod, is a rhizomatous perennial herb in the family Asteraceae native to much of temperate North America, where it occupies moist meadows, lake and river shores, prairie swales, and disturbed sandy ground. Plants grow 60–150 cm tall with slender, leafy, much-branched stems that are often somewhat glaucous. The leaves are alternate, sessile, narrowly linear to lanceolate, 4–13 cm long but only 3–10 mm wide, with three to five prominent parallel veins, entire margins, and conspicuous resin dots that release a pleasant scent when crushed. Distinctively for a goldenrod relative, the inflorescence is a broad, flat-topped corymb of small bright yellow heads rather than a one-sided plume. Each head is 4–5 mm long and contains around fifteen to twenty short ray florets surrounding a smaller number of disc florets. Flowering occurs from late summer to early autumn. The fruit is a short, hairy achene with a pappus of fine white bristles.