278 SALICACEAE 



POPULUS. Poplar. Branchlets have terminal buds, which are resinous and 

 have several scales. Ls. usually broadest below middle, long-stalked. Catkins 

 drooping, stamens numerous. 



(a) Ls. white- or grey-felted below {White Poplars) 



P. alba. White Poplar, Silver Poplar. 60. February-March. D. Bark smooth, 

 young branchlets white-felted. Ls. ov., 2, palmately 3-5-lobed. Europe 

 (including Britain) and North and West Asia. (Fig. 28 D.) 



P. canescens. Grey Poplar. 100. March. D. Young branchlets white-felted. 

 Ls. roundish ov., 4, coarsely and unevenly toothed. West Europe 

 (including Britain). (Fig. 109 h.) 



{b) Ls. with clear translucent border (Black 

 Poplars) 



P. angulata. Carolina Poplar. 100. March. D. Branchlets angular or ribbed, 

 hairless; buds greenish. Ls. ov., 7, heart-shaped or straight base, margins 

 hairy, teeth small and curved ; stalk flattened, with glands at base. East 

 United States. (Fig. no a.) 



P. Eugenei. 150. D. Tall and narrow tree; branchlets hairless; buds small 

 and sticky. Ls. ov., 3, long-pointed, coarsely toothed, margins hairy. 

 Hybrid. (Fig. hoc.) 



P. generosa. D. Buds large and sticky. Ls. ov., 12, teeth even, curved, gland- 

 tipped; glands at base of 1. -stalk. Hybrid. (Fig. no f.) 



P. monilifera [P. canadensis). Canadian Black Poplar, Necklace Poplar. 100. 

 D. Ls. ov., 5, heart-shaped base, long-pointed, teeth large and curved, 

 margins hairy, green on both sides; stalk flattened, with glands at base. 

 East North America. (Fig. no b.) 



P. nigra. Black Poplar. 100. March. D. Branchlets cylindrical, hairless; 

 buds sticky. Ls. usually diamond-shaped or triangular, 4, shallowly 

 round-toothed, no glands at base; stalk flattened. North Asia. (Fig. 109 j.) 

 Variety italica. Lombardy Poplar. Tall and narrow. 



P. serotina. Black Itahan Poplar. 100. D. Branchlets green, hairless, slightly 

 angled. Ls. ov., triangular, 6, glands at base. Hybrid. (Fig. 109 k.) 



(c) Ls. without clear translucent border ; stalk 

 flattened {Aspens) 



P. tremula. Aspen. 50. February. D. Branchlets hairless; buds bright 

 brown. Ls. broadly ov., 2, coarsely and unevenly blunt-toothed, greyish 

 green. Europe (including Britain), North Africa, North Asia. (Fig. hod.) 



P. tremidoides. American Aspen, ico. February. D. Branchlets reddish 

 brown, hairless. Ls. broadly ov., 2, finely toothed, dark glossy green 

 above. North America. (Fig. i ice.) 



{d) Ls. without clear translucent border; stalk not 

 or slightly flattened {Balsam Poplars) 



P. angustifolia. Willow-leaved Poplar. 60. D. Branchlets cylindrical; buds 

 long-pointed, sticky. Ls. lane, 5, tapering base, minutely and evenly 

 round-toothed, green on both sides. North America. (Fig. no h.) 



P. candicans {P. balsamifera, P. tacamahaca). Balm of Gilead, Balsam Poplar, 



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