100 



TREES OP THE NORTHERN UNITED STATES 



Fruit as large as peas, purple-black, bitter ; 

 ripe in autumn. A fine tree, 15 to 60 ft. 

 high, with reddish-brown branches. Wood 

 reddish and valuable for cabinet-work. Com- 

 mon in woodlands and along fences. 



11. Prunus Virginians, L. (CHOKE- 

 CHEEKY.) Leaves thin, oval-oblong or obo- 

 vate, abruptly pointed, very sharply, often 

 doubly serrate, with slender teeth. Ra- 

 cemes of flowers and fruit short and close. 

 Fruit dark crimson, stone smooth. Flowers 

 in May ; fruit ripe in August ; not edible 

 till fully ripe. A tall shrub, sometimes a 

 tree, with gray- 

 ish bark. River- 

 banks, common 

 especially north- 

 ward. 



P. VlrginiAna. 



12. Primus Padus, L. (SMALL BIRD- 

 CHEERY.) Like Prunus Virginiana, ex- 

 cepting that the racemes are longer and 

 drooping, and the stone is roughened. 

 Occasionally planted for ornament. 



P. F&dus. 



GENUS 37. PYBT7S. 



Trees and shrubs, with alternate, stipulate, simple, or 

 pinnately compound leaves. Flowers conspicuous, white 

 to pink, apple -blossom -shaped (5 petals); in spring. 

 Fruit a fleshy pome, with the cells formed by papery or 

 cartilaginous membranes within juicy flesh. 



* Leaves deeply pinnatifid or fully pinnate (Mountain Ashes) . . ( A. ) 

 A. Leaf deeply pinnatifid, sometimes fully divided at the base . 6. 

 A. Leaf once-pinnate throughout. (B.) 



B. Leaf-buds pointed, smooth and somewhat glutinous 7. 



B. Leaf -buds more or less hairy 8, 9. 



* Leaves simple and not pinnatifid. (C.) 



C. Leaves entire; fruit solitary (Quinces) 5. 



C. Leaves serrate ; fruit clustered. (D.) 



D. Fruit large, sunken at both ends ( Apples) 1. 



