Ainus Ainus, (L.) Gaertner

2. A. glutinosa (L.) Gaertner , Fruct. Sem. Pl. 2: 54 (1790).

Tree or shrub up to 20(-35) m, with dark brown, fissured bark;

buds shortly stalked. Young twigs viscid, usually glabrous. Leaves (3—)4—10 cm, obovate-elliptical to suborbicular, obtuse or retuse, cuneate or rounded at base, biserrate, green on lower surface, usually glabrous except for tufts of yellowish hairs in the axils of the veins; lateral veins 5-8 pairs. Fruiting catkins 10- 30 mm, ovoid, pedunculate, 3-5 in a raceme. Nutlet narrowly winged. 2« = 28. Europe, except the extreme north and south. All except BI Cr Fa Is Sb; introduced in Az.

A. glutinosa x incana ( A. xpubescens Tausch ) is not uncommon in the areas where the parents grow together. It usually has the young twigs pubescent, leaves obtuse to shortly acuminate, usually pubescent at least on the veins, and the female catkins shortly pedunculate.