. 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. 178 Les Peupliers Les feuilles sont générale triangulaire-ovales, finement dentées et carrément plutôt, pointu, parfois longues pointes, lo à 17 cm. de long, ferme, la base tronquée, légèrement en forme de coeur ou en forme de coin largement rarement ; lorsque de très jeunes qu'ils sont un peu velues, mais bientôt deviennent lisses des deux côtés, d'un vert vif et brillant au-dessus, plus pâle en dessous ; les tiges sont aplatis latéralement et environ aussi longtemps que les

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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. 178 The Poplars The leaves are broadly triangular-ovate, rather finely and bluntly toothed, pointed, sometimes long-pointed, lo to 17 cm. long, firm in texture, the base truncate, slightly heart-shaped or rarely broadly wedge-shaped; when very young they are somewhat hairy, but soon become smooth on both sides, bright green and shining above, paler beneath; the leaf-stalks are laterally flattened and about as long as the blades; the narrow stipules are i to 2.5 cm. long. The catkins are short- stalked, and at flowering time in April or May are 7 to 12 cm. long, their scales fringed by numerous filiform lobes, the staminate ones densely flowered and 10 to 12 mm. thick; the pistillate flowers are short-stalked, the disk small and appressed to the ovary, which is surmounted by 3 or 4 large lobed stigmas. In ripening the pistillate catkins elongate greatly, becoming 15 to 25 cm. long; the capsules are ovoid, pointed, 8 to 10 mm. long, and about as long as their stalks. The tree grows with great rapidity, young plants often increasing in height as much as 4 meters during a season. The wood is soft, weak, and brown, with a specific gravity of about 0.39; it is used for boxes and for paper-pulp. M. Dode, a French dendrologist, has expressed the view that the Carolina poplar can be di- vided into several species. 15. WESTERN COTTONWOOD —Populus Saigentii Dode Populus deltoides occidentalis Rydberg This species is very closely related to Populus deltoides Marshall, of which it has been regarded as a variety. It is a very large tree, with spreading branches, and inhabits river bottoms from Saskatchewan and Al- berta to South Dakota, Ne- braska, Kansas, Colorado, and New Mexico. The bark is gray, that of old trees thick. The young twigs are smooth, greenish, be- coming light yellow and shin- ing. The bu

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