ANALYTICAL KEY 9 



horizontal. Wild Black Cherry, PRUNTTS SEROTINA (p. 80). 



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



small, round. Choke Cherry, PRXTNUS VIRGINIANA (p. So). 



j. Flowers umbellate. 



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



less in length), appearing with the leaves. 



Wild Red Cherry, PRUNTTS PENNSYLVANICA (p. 80). 

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

 length), appearing before the leaves. 



Wild Plum, PRXTNUS AMERICANA (p. 80). 

 1, Ovary two— five-celled. 

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

 j. Branches not spiny. 



Serviceberry, AMELANCHIER CANADENSIS (p. 7?)- 

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

 b. Climbing shrubs (Hanas), 

 c. Twiners, 

 d. Leaves Opposite; corolla sympetalous, irregular. 



Honeysuckle, LONICERA DIOICA (p. 118). 

 d. Leaves not opposite; corolla polypetalous, regular. 



Bittersweet, CELASTRTIS SCANDENS (p. 90). 

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

 inconspicuous, fragrant (.Grape'). 

 d. Lower leaf surface woolly or tomentose. 

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



Fox Grape, VITIS LABRTJSCA (p. 92), 

 ts. 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 VXTLPINA (p. 93). 

 "b. Erect or prostrate shrubs, not climbing. 

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

 di 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, PINUS RIGIDA (p. 31). 



f. Leaves single. 

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



Juniper, JUNIPERUS COMMUNIS (p. 32). 

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



Yew, TAXUS CANADENSIS (p 30). 

 d. Leaves narrowly oblong or broaj3er (rather narrow and white beneath in 

 Andromeda) ; flowers showy. 

 e. Leaves compound; bristly, tailing shrub. RUBUS HISPIDUS (p. 81). 

 e. Leaves simple {Heath family). 

 f. Stems erect. 

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

 nearly separate. Labrador Tea, LEDUM GROENLANDIGUM (p. loi). 

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

 distinctly sympetalous. 

 hi Corolla cylindrical or bell-shaped. 

 1, Leaves glaucous whitish beneath. 



