TREES AND SHRUBS 



downy, generally reddish ; Bai-k grey, smooth ; Buds pubescent, not viscid ; 

 Suckers numerous, pubescent ; JFood white, soft, not very useful ; employed for 

 paper-pulp. Heartwood begins to decay after about 50 years, often hastened by 

 larvje of Goat Moth and Wood Leopard Moth. 



Indigenous throughout British Isles ; somewhat slow of growth. Galls on 

 petioles produced by larvae of Diplosis t?~e?tmlce, a Gall-gnat. Name Aspen from 

 A.S. fesjJC, ceps, the Aspen-tree. 



AMERICAN ASPEN, Populus tremuloides. 



March, April. 



Floicers didecious ; Male catkins 1J-2J ins. long; Stamens 6-12, inserted on 

 disk, disk oblique, entire, scales acute, 3-5-lobed, hairy ; Females lengthening to 

 4 ins. ; Ovai-y conical, nearly sessile in bottom of crenate disk, style short, 

 thick, stigmas 2, erect, club-shaped, each 2 linear diverging lobes ; Fruit a 

 1 -celled, 2-valved capsule, oblong-conical, green. 



Leaves alternate, ovate or nearly orbicular, acute, glandular, serrate, thin, 

 firm, glabrous, dark shining green above, pale yellow-green below, l-J-2 ins. 

 long and broad ; petioles slender, laterally compressed. 



A deciduous tree, 20-50 ft. ; Branches slender, often contorted, pendulous at 

 extremities, glabrous ; Tivigs red-brown to grey ; Bark thin, pale, roughened ; 

 Buds conical, acute, resinous, scales red-brown, glabrous ; Wood light brown. 



Native of North America. 



Class I Dicotyledons 



Division W. . . . Incompletce 

 Natural Ordeh . . . Empetracece 



Heath-like evergreen shrubs, with alternate, exstipulate leaves, and small, 



regular, unisexual axillary flowers ; Perianth of 4-G persistent scales, in 2 



whorls, often considered as sepals and petals ; Stamens 2-3, alternate with petals, 



hypogynous ; Ovarij 2-9-celled ; Fruit a drupe, with 2-9 bony, 1 -seeded stones. 



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