Tree to 15 m; lvs long-petioled, broadly cordate-ovate, entire or 3-5-angled, 1.5-2.5(-8) dm, hairy or even tomentose beneath with stellate or branched hairs; fls 5-7 cm; fr pointed, 3-4 cm; 2n=40. Native of China, escaped from cult. in s. U.S. and n. to se. Conn., Pa., O., Ind., and Mo. Apr., May.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.