Broussonetia papyrifera (L.) L'Hér. ex Vent.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Tall shrub or small tree with smooth bark and pubescent twigs; lvs firm, broadly ovate, serrate and often lobed, scabrous above, densely pubescent beneath; staminate catkins slender, 5 cm; pistillate catkins 1–2 cm thick; fr 2–3 cm thick; 2n=26. Native of China and Japan, occasionally escaped from cult. from N.Y. to Mo. and s. Apr., May. (Papyrius p.)