8o 



ROSACEAE (ROSE FAMILY) 



PRUNUS 



Small trees or shrubs with 5-cleft calyx, 5 spreading petals, 15 

 to 20 stamens, and a solitary pistil which becomes a fleshy drupe. 



P. serotina. Wild Black Cherry. Large tree with reddish-brown 

 branches, the inner bark aromatic; leaves oblong or lanceolate, taper- 

 pointed, serrate, with short incurved teeth; flowers in racemes; fruit 

 purplish-black. Woods. 



P. virginiana, Chokecherry. Shrub or small tree with grayish bark, 

 inner layers with a disagreeable odor; leaves oval to obovate, abruptly 

 pointed, very sharply serrate, with slender teeth; fruit red turning to 

 dark crimson. Woods. 



P. pennsylvanica, Wild Red Cherry. Tree 6 to 10 m. high, with , 

 light red-brown bark; leaves oblong, lanceolate, pointed, sharply 



serrate, shining, green, and 

 smooth on both sides; flow- 

 ers numerous, in umbel-like 

 clusters; fruit light red, 

 very small. Rocky woods 

 and clearings. 



P. pumila. Sand Cherry. 

 Prostrate, spreading and 

 creeping; leaves linear, stipu- 

 late, oblanceolate, almost en- 



Prunus; a. P. p^i.ylvanica, Wild red cherry; ^'^'.^ °^ toothed above the 



middle; flowers 2 to 4 m 

 cluster; fruit dark purplish- 



fr, P. pumila. Sand cherry. 



red. Sandy and rocky shores. 



P. americana, Wild Plum. Tree 3 to 10 m. high; leaves more or 

 less thorny, narrowly obovate, long, acuminate, sharply serrated; 

 flowers large ; petals narrowly obovate, about i cm. long ; fruit becoming 

 red at maturity, about 2 cm. in diameter. River banks and borders 

 of woods. 



RUBUS 



Perennial herbs or somewhat shrubby, with white or reddish 

 flowers, numerous stamens, usually numerous carpels becoming 

 small drupes collected on a spongy or fleshy receptacle. 



R. idaeus aculeatissimus, Red Raspberry. Prickly stemmed, up- 

 right shrubs, and beset with straight stiff bristles; leaflets 3 to 5, 



