A. cordifblius - Color, pale blue; the disk sometimes reddish or purplish. Leaves, thin, petioled, strongly heart-shaped at base, 2 to 5 inches long, sparsely hairy on the surface and along the veins, the lower petioles fringed with short hairs. Bracts of the involucre tipped with green points. Stem, smooth, much branched, so as to seem bushy, 1 to 5 feet high. Flowers, small, crowded in panicles. August to October.