Japan Flora: Resembles A. devilis; plant glabrous; leaves cordate or broadly ovate-cordate, 4-10 cm. long, 3.5-8 cm. wide, acute or obtuse, cordate, thinly membranous, glaucescent, the petioles 1- 7 cm. long; flowers few in axils, fascicled, the pedicels 1-4 cm. long; calyx-tube inflated and globose at base, the limb dilated, obliquely truncate, narrowly deltoid, long-acuminate to a filiform point; fruit obovoid-globose, about 3 cm. long. July-Aug.