Japan Flora: Tall erect tree; branch grayish brown, densely glandular-pubescent when young; leaves large, petiolate, the leaflets 9-21, ovate-oblong, 8-12 cm. long, 3-4 cm. wide, abruptly acute to acuminate, appressed-serrulate, minutely stellate-pubescent above while young, rather densely stellate-pubescent beneath, sessile and obliquely truncate at base; petioles and rachis densely glandular; staminate aments 10-30 cm. long; pistillate aments 10- to 20-flowered, pedunculate, densely brown-pubescent with crisped hairs; nut pubescent, with a hard shell, broadly ovoid to nearly globose, 2.5- 3.5 cm. long, mucronate, rugose, with raised sutures. May.

Hokkaido, Honshu, Shikoku, Kyushu; very variable.

var. cordiformis (Maxim.) Rehd. Nut cordate or cordate-ovoid, rather depressed, the shell rda- tively thin, nearly smooth, with a shallow groove on each side. Cultivated.