. Les arbres de l'Amérique du Nord : être des descriptions et des illustrations de l'arbres croissant indépendamment de la culture en Amérique du Nord, au nord du Mexique et les Antilles . Les arbres. 347 Orme ailé le dur, lourd, fort bois est lumière rousse et est utilisé localement pour les meubles. L'arbre a été planté pour l'ombre dans certaines villes du sud. 3. - L'orme liège Ulmus Thomasi Sargent Ulmus racemosa Thomas, pas Borckhausen l'orme liège, souvent appelé Orme, et parfois, l'orme d'Hickory habite les pentes et pistes de ski, se produisant à partir de Québec et l'Ontario au Michigan et Wis- consin, au sud de New York

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. North American trees : being descriptions and illustrations of the trees growing independently of cultivation in North America, north of Mexico and the West Indies . Trees. Winged Elm 347 The hard, heavy, strong wood is light reddish brown in color and is locally used for furniture. The tree has been planted for shade in some southern cities. 3. CORK ELM — Ulmus Thomasi Sargent Ulmus racemosa Thomas, not Borckhausen The Cork elm, often called Rock elm, and sometimes Hickory elm, inhabits hillsides and slopes, occurring from Quebec and Ontario to Michigan and Wis- consin, south to Connecticut, northern New Jersey, Ohio, Missouri, and eastern Nebraska. It attains a maximum height of about 35 meters, and the trunk is occasionally at least i meter in thickness. The bark is thick and deeply fissured, gray or gray-brown and scaly. The young twigs are brownish and softly velvety, becoming smooth after the first or second sea- son, and usually developing two, three, or four corky wings, which become about .1 cm. wide. The oval to obovate leaves are short-pointed, firm in texture, coarsely and usually doubly toothed, 5 to 12 cm. long, the upper surface smooth, shining and dark green at maturity, with the veins impressed, the lower surface finely hairy, pale green, with the nerves promi- nent; the large stipules fall away early; the leaf- stalks are 4 to 10 mm. long. The flowers appear before the leaves in early spring in small smooth clusters, each borne on a very slender, drooping stalk nearly i cm. long and much longer than the calyx; the bell-shaped ' ^°'^' calyx is lobed only to or above the middle, with blunt lobes; the stamens are a httle longer than the calyx, and the ovary is hairy. The oval samaras are 12 to 20 mm. long, finely hairy all over, their short tips incurved. The wood is used extensively for bridges, sills, agricultural implements, and railroad ties, being very strong and durable; it is light brown with a specific gravity of 0.73. The tree is occasio

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