ANALYTICAL KEY 9 



horizontal. WILD BLACK CHERRY, PRUNTTS SEROTINA (p. 80). 

 k. Leaves obovate, sharply serrate, the teeth spreading; lenticels 

 small, round. CHOKE CHERRY, PRUNTJS VIRGINIANA (p. 80). 

 j. Flowers umbellate. 



k. Bark red-brown; plant not spiny; flowers small (petals 6 mm. or 

 less in length), appearing with the leaves. 



WILD RED CHERRY, PRTJNTTS PENNSYLVANICA (p. 80). 

 k. Bark black; plant spiny; flowers large (petals 8 mm. or more in 

 length), appearing before the leaves. 



WILD PLUM, PRUNUS AMERICANA (p. 80). 

 i. Ovary two five-celled. 



j. Branches spring. HAWTHORN, CRATAEGUS (many species), (p. 77.) 

 j. Branches not spiny. 



SERVICEBERRY, AMELANCHIER CANADENSIS (p. 77). 

 a. SHRUBS (including woody vines). (p. 14). 

 b. Climbing shrubs (lianas). 

 c. Twiners, 

 d. Leaves opposite; corolla sympetalous, irregular. 



HONEYSUCKLE, LONICERA DIOICA (p. 118). 

 d. Leaves not opposite; corolla polypetalous, regular. 



BITTERSWEET, CELASTRTJS SCANDENS (p. 90). 

 C. Plants climbing by tendrils; bark shreddy; leaves heart-shaped; flowers 



inconspicuous, fragrant (Grape). 

 d, Lower leaf surface woolly or tomentose. 

 e. Each of several successive leaves opposite a tendril or an inflorescence. 



Fox GRAPE, VITIS LABRUSCA (p. 92). 

 e. Every third leaf not opposite a tendril or an inflorescence. 



SUMMER GRAPE, VITIS AESTIVALIS (p. 92). 

 d. Lower leaf surface smooth or merely pubescent. 



RIVER GRAPE, VITIS VULPINA (p. 93). 

 1). Erect or prostrate shrubs, not climbing. 

 C. Evergreens with tough and leathery leaves (p. 10). 



d. Leaves very narrow, mostly awl- or needle-shaped, not white beneath. 

 e. Flowers yellow, showy, not in catkins; leaves minute. 



HUDSONIA TOMENTOSA (p. 94). 



e. Flowers inconspicuous or in catkins; leaves not minute. 

 f. Leaves three in a cluster. PITCH PINE, PINTJS RIGIDA (p. 31). 



f. Leaves single. 

 g. Leaves in whorls of three, sharp-pointed, whitish above. 



JUNIPER, JUNIPERUS COMMTJNIS (p. 32). 

 g. Leaves scattered, blunt, green on both surfaces. 



YEW, TAXTJS CANADENSIS (p 30). 

 d, Leaves narrowly oblong or broajder (rather narrow and white beneath in 



Andromeda); flowers showy. 



e. Leaves compound; bristly, tailing shrub. RUBTJS HISPIDTJS (p. 81). 

 e. Leaves simple (Heath family). 

 f. Stems erect. 



g. Leaves conspicuously hairy beneath; stamens five to seven; petals 



nearly separate. LABRADOR TEA, LEDTJM GROENLANDICTJM (p. 101). 



g. Leaves smooth or but slightly hairy beneath; stamens ten; corolla 



distinctly sympetalous. 

 h. Corolla cylindrical or bell-shaped. 

 i. Leaves glaucous whitish beneath. 



