Information

Trees, to 28 m; trunks often several, crowns narrow or pyramidal. Bark gray, smooth, darkening and breaking into shallow rectangular plates in age; lenticels inconspicuous. Winter buds stipitate, ellipsoid, 6--10 mm, apex rounded, long; stalks 2--8 mm; scales 2--3, outer 2 equal and valvate, usually heavily resin-coated. Leaf blade ovate to elliptic, 6--16 × 3--11 cm, leathery, base broadly cuneate to rounded, margins strongly revolute, deeply doubly serrate or crenate, with distinctly larger secondary teeth, apex acute to obtuse; surfaces abaxially glabrous to sparsely pubescent. Inflorescences formed season before flowering and exposed during winter; staminate catkins in 1 or more clusters of 2--6, 3.5--14 cm; sistillate catkins in 1 or more clusters of 3--8. Flowering before new growth in spring. Infructescences ovoid to nearly globose, 1--3.5 × 0.6--1.5 cm; peduncles 1--10 mm. Samaras ovate or elliptic, wings much narrower than body, irregularly elliptic to obovate, leathery. 2n = 28.