bcd 4 e 2 f* KEY, BASED UPON LEAVES. 5 



f 2 Drupe-like, but containing 2-6 one-seeded nutlets; Ivs. lanceolate to oblong, 

 membranaceous and markedly wrinkled. 



MOUNTAIN HOLLY (Ilex monticola). 

 f 3 A pome (apple) ; leaves ovate to oblong or oval, firm, mostly rounded b. 



and leaf stalks 

 g Slender, long and smooth. 



h Leaves glabrous ab. and usually bn., sharply and widely serrate; fr. 

 % in. or less, in loose racemes. 



SERVICE-BERRY (Amelanchier Canadensi*) . 



h2 Leaves lustrous ab., smooth bn., appressed serrate or subentire; fr. 

 usually tapering to the stem, containing grit cells. 



PEAR (Pyrus communis) . 



g2 Short, stout, gray-tomentose as is the under surface of Ivs.; fr. hollow- 

 ing at stem and without grit-cells APPLE (Pyrus Mains) . 



f 4 Capsule, which is 



g 1-celled, dehiscent by 2 valves, % in. or less 1; seeds with silky hairs; 

 h Leaf-buds covered with single scale; leaves 



i Linear-lanceolate, very long taper-pointed and drooping. 



WEEPING WILLOW (Salix babylonica). 



12 Narrow-lanceolate, green bn.; petioles not glandular; finely serrate. 



BLACK WILLOW (Salix nigra). 



13 Lanceolate; petioles 



j Glandular; glabrous bn., coarsely serrate; branchlets greenish and 



very brittle BRITTLE WILLOW (8. fragilis). 



j2 Not glandular; pale bn.; stipules. 



k Foliaceous; branchlets hoary-pubescent. 



WARD'S WILLOW (Salix longipes) . 

 k2 Deciduous; leaves 



1 Glabrous ab., whitish and glaucous bn.; branchlets yellow. 



YELLOW WILLOW (S. vitellina). 

 12 Silky-pubescent both sides; branchlets greenish. 



WHITE WILLOW (S. alba). 



1* Broad lanceolate, smooth above, pale and glaucous bn.; petioles long 



and not glandular. . . .PEACH-LEAF WILLOW (Salix amygdaloides) . 



is Lance-ovate, very lustrous dark green ab., firm; petioles glandular. 



SHINING WILLOW (S. lucida). 



16 Oblanceolate and lanceolate, pale bn., finely serrate; stipules folia- 



ceous; branchlets first season and buds hairy. 



MISSOURI WILLOW (S. Missouriensis). 



1 7 Ovate-oblong, rounded or subcordate b., acute a. 



BALSAM WILLOW (Salix basamifera). 

 h2 Buds covered by several scales; 



1 Leaves lanceovate, cuneate or rounded b., bluntly pointed a. 



NARROW-LEAF COTTONWOOD (Populus augustifolia) . 

 12 Leaves ovate-orbicular, subcordate. 



TWEEDY'S COTTONWOOD (P. Tweedyi). 



g2 5-celled, dehiscent by 5 valves: leaves lance-obovate to oblong, tapering 

 both ways, remotely serrate above the middle and 



