U. racemòsa.
4. Úlmus racemòsa, Thomas. (Cork or Rock Elm.) Leaves 2 to 4 in. long, obovate-oblong, abruptly pointed, often doubly serrated, with very straight veins; twigs and bud-scales downy-ciliate; branches often with corky ridges. Fruit large (½ in. or more long), with a deep notch; hairy. A large tree with fine-grained, heavy and very tough wood. Southwest Vermont, west and south, southwestward to Missouri, on river-banks.
U. alàta.
5. Úlmus alàta, Michx. (Wahoo or Winged Elm.) Leaves small, 1 to 2 in. long, ovate-oblong or oblong-lanceolate, acute, thickish, downy beneath and nearly smooth above, sharply serrate. Bud-scales and branchlets nearly smooth. Notch in the wing of the fruit deep. A small tree, 30 to 40 ft. high, the branches having corky wings. Wild, Virginia, west and south; rarely cultivated.
U. Americàna.
6. Úlmus Americàna, L. (American or White Elm.) Leaves 2 to 4 in. long, obovate-oblong or oval, abruptly sharp-pointed, sharply and often doubly serrated, soft-pubescent beneath when young, soon quite smooth; buds and branchlets smooth. Fruit ½ in. long, its sharp points incurved and closing the deep notch; hairy only on the edges. A large ornamental tree, usually with spreading branches and drooping branchlets, forming a very wide-spreading top. Wild throughout in rich, moist soil; common in cultivation.
Genus 75. PLÁNERA.