1004 The Trees of Great Britain and Ireland 



A. Leaf-sheath entirely deciduous. Leaves in fives. 



i. Strobus, Spach. White Pines. 



Leaves serrate in margin, with marginal resin-canals. Cones sub-terminal, 



elongated, pendulous, usually long-stalked ; scales thin, each with a terminal 



unarmed umbo. Seeds with long wings, closely adherent and breaking off 



irregularly. 



* Branchlets glabrous. 



i. Pinus excelsa, Wallich. Himalayas. Seep. ion. 



Branchlets glaucous, green. Buds conic, shortly acuminate. Leaves 5 to 8 



in. long, spreading, slender ; some sharply bent as if broken. 



2. Pinus Peuke, Grisebach. Balkan Peninsula. See p. 1014. 



Branchlets shining green. Buds ovoid, shortly acuminate. Leaves about 

 4 in. long, densely tufted towards the end of the shoot, and not spreading or 

 broken as in P. excelsa. 



** Branchlets pubescent. Bud-scales free at their apices. 



3. Pinus Ay acahuite, Ehrenberg. Mexico. Seep. 1017. 



Branchlets covered with a short rusty-brown pubescence. Buds ovoid, 

 acuminate, resinous. Leaves 4 to 6 in. long, spreading, occasionally bent as 

 if broken, as in P. excelsa. 



*** Branchlets pubescent. Bud-scales closely oppressed. 



4. Pinus Lambertiana, Douglas. Oregon, California. See p. 1020. 



Branchlets with short brown, partly glandular pubescence. Buds cylindrical, 

 rounded at the apex or sharp-pointed. Leaves about 4 in. long, twisted a 

 complete turn, rigid, ending in a sharp cartilaginous point. 

 ^ 5. Pinus monticola, Don. Western North America. See p. 1022. 



Branchlets with short brown, partly glandular pubescence. Buds ovoid, 

 acuminate. Leaves 4 in. long, slightly twisted in their upper half, blunt at the 

 apex. 

 Pinus Strobus, Linnaeus. Eastern North America. See p. 1025. 



Branchlets with pubescent tufts below the insertions of the leaf-clusters, 

 elsewhere usually glabrous. Buds ovoid, acuminate. Leaves 3 in. long, very 

 slender, not twisted. 

 7. Pinus parviflora, 1 Siebold et Zuccarini. Japan, Kurile Isles. See p. 1033. 



Branchlets greyish, with a scattered minute pubescence. Buds ovoid, not 

 acuminate. Leaves 2 in. long, white on the inner surfaces, blunt at the apex. 



2. Cembra, Spach. Stone Pines. 



Leaves serrate or entire in margin, with median or marginal resin-canals. 

 Cones sub-terminal, short-stalked ; scales thickened, each with a terminal 

 unarmed umbo. Seeds large, edible, with rudimentary or obsolete wings. 



1 This species, which is variable in the length of the seed-wing, is intermediate in character, and forms a connecting 

 link between the first two sections. 



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