. 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. L'Oaks 322 2,5 à 7 cm. de long, émoussé et arrondi ou pointu rarement au sommet, arrondies ou en forme de cœur à la base, entières, shghtly, ondulées ou rarement sur la crantée mar- gin ; ils sont épais et ferme, vert bleuâtre, lisse ou légèrement velues, avec une nervure médiane jaune- lowish au-dessus, vert jaunâtre, couvert de poils brunâtre, mais de plus en douceur, avec des vieux, nervation sous quand les nouvelles feuilles persistantes imtil appe

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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. 322 The Oaks 2.5 to 7 cm. long, blunt and rounded, or seldom sharp-pointed at the apex, rounded or heart-shaped at the base, entire, shghtly wavy, or rarely toothed on the mar- gin; they are thick and firm, bluish green, smooth or slightly hairy, with a yel- lowish midrib above, yellowish green, covered with brownish hairs, but becoming smooth, with prominent venation beneath when old, persistent imtil the new leaves appear; the leaf-stalk is slender, hairy, 6 to 12 mm. long. The flowers open in April or May in clustered numerous slender hairy catkins 5 to 7.5 cm. long, their calyx slightly hairy and yellow; stamens exserted, their anthers oblong, shghtly notched, smooth and yellow. The pistillate flowers are on slender stalks, their involucral scales broad and hairy; styles short, broad and spreading. The fruit, ripening the first season, is usually short-stalked; nut oblong or oval, 18 to 25 nmi. long, dark brown and striped, soon becoming fighter colored; cup deeply saucer-shaped or top-shaped, 12 to 18 mm. across, fight brown and hairy inside, embracing about one third of the nut, covered by ovate brownish pale wooUy scales, those at the base of the cup thickened. The wood is hard, strong but brittle, close-grained, dark brown; its specific gravity is about 0.94. It checks badly on drying, and is probably used only for fuel. A probable hybrid with Q. dumosa is reported. 40. TOUMEY'S OAK — Quercus Toumeyi Sargent This smaU-leaved, fittle known oak occurs, in so far as known, only in Ari- zona, where it attains a height of 10 meters, with a trunk diameter of 2 dm. The short trunk forks into several widely- spreading branches. The bark is 18 mm. thick, deeply furrowed, dark reddish brown with thin close scales. The twigs are slender, reddish and hairy, becoming dark brown to nearly black. Th

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