. Nord America : alberi essendo descrizioni e illustrazioni degli alberi che crescono in modo indipendente di coltivazione in America del Nord, a nord del Messico e le Indie occidentali . Alberi. Il Hemlocks 63 zioni dallo stelo, sono rigidi, dritto, o ma httle incurvata, lineare, 1,5 a 2 cm., I 1,5 mm. ampia e piatta con una spessa bruscamente punta; la loro superficie superiore è di colore biancastro con diverse righe di stomata su ogni lato della nervatura shght, il lato inferiore è leggermente arrotondato o keeled, verde e splendente. In vigorosa, sterili branchlets le foglie sono più grandi e molto più bianchi. Il stami- natc fiori, che sono

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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. The Hemlocks 63 tions from the stem, are stiff, straight, or but httle incurved, linear, 1.5 to 2 cm. long, I to 1.5 mm. wide, flat, with an abruptly thick tip; their upper surface is whitish with several rows of stomata on each side of the shght ridge, the under side is somewhat rounded or keeled, green and shining. On vigorous, sterile branchlets the leaves are larger and much whiter. The stami- natc flowers, which are very abundant at the end of the smaller branchlets, are oblong- cylindric, 2.5 cm. long, darkish red and subtended by an ample involucre of enlarged bud- scales. The pistillate flowers, produced at the ends of the stiff, terminal branchlets, are oblong, obtuse, 2.5 cm. long. The cones are pendent, oblong- cyhndric, 5.5 to 10 cm. long, 2.5 to 4 cm. thick, at first yellowish, at maturity yellow to red-brown, shining; they fall off during the first winter; their oblong scales are thin, stiff, rounded, and slightly toothed. The bracts, which are half the length of the scales, are stiff, lanceolate, and slightly toothed. The seeds are pale red-brown, about 2 mm. long, their oblong wing being about 12 mm. in length. The wood is soft, straight-grained, light reddish brown; its specific gravity is about 0.42. It is the principal lumber of Alaska and is extensively used in Wash- ington for general carpentering, boat building, and paper pulp. This is one of the handsomest of spruces and thrives well in Europe, but in the eastern United States it is unable to withstand the extreme and frequent changes of the weather. IV. THE HEMLOCKS GENUS TSUGA [ENDLICHER] CARRIERE |IGHT species of Hemlocks are known, tall, straight trees, which occur, like the aUied genera, only in the cooler portions of the northern hem- isphere, but are absent in Europe. North America has four, and Asia the same numbe

Parole chiave associate all'immagine

• bookcentury1900
• bookdecade1900
• bookpublishernewyorkhholtandco