abcd-'e'f 8 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). 

 fs 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 com m unis ) . 



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, *4 in. or less 1; seeds with silky hairs; 

 li Leaf-buds covered with single scale; leaves 



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



WEEPING WILLOW (Salix babylonica) . 



1 2 Narrow-lanceolate, green bn. ; petioles not glandular; finely serrate. 



BLACK WILLOW (Salix nigra). 



1 3 Lanceolate ; petioles 



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



very brittle BRITTLE WILLOW (8. fragilis). 



j 2 Not glandular; pale bn.; stipules. 



k Foliaceous; branchlets hoary-pubescent. 



WARD'S W T ILLOW (Salix longipes). 

 k2 Deciduous; leaves 



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



YELLOW WILLOW (S. vitellina). 

 I 2 Silky-pubescent both sides; branchlets greenish. 



WHITE WILLOW (8. alba). 



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



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



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



SHINING WILLOW (S. lucida). 



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

 ceous; branchlets first season and buds hairy. 



MISSOURI WILLOW (8. Missouriensis). 

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



BALSAM WILLOW (Salix basamif era). 

 l\- Buds covered by several scales; 



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



NARROW-LEAF COTTONWOOD (Populus augustifolia) . 

 12 Leaves ovate-orbicular, subcordate. 



TWEEDY'S COTTONWOOD ( P. T weedy i ) . 



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

 both ways, remotely serrate above the middle and 



