Oblong-leaved aster, or aromatic aster, is a much-branched perennial with fragrant foliage. Flowerheads terminal, few to many heads, with 20–40 ray florets that are blue or purple (rarely rose pink); disk florets yellow. Blooms July–November. Leaves alternate, sessile, narrow, clasping the stem, with or without small “ears” at the base, oblong to lance-shaped, lacking teeth, from 1–3½ inches long.
Similar species: There are 24 species of Symphyotrichum in Missouri, plus many hybrids and varieties. This species is notable for the fragrance of its foliage and its crowded, stalkless, clasping, hairy, narrow (oblong) leaves. For more information about our native New World asters, see their group page.