ROSACEA 



357 



478. Prunus Americana. 47y. Prunus angustifolia. 



F. angiiBtildlia, Marsh. Chickasaw plum. Mountain cherry. Fig. 479. 

 Smaller, the young growths smooth and zigzag and usually reddish: leaves 

 lanceolate to oblong-lanceolate, often trough-shaped, shining, finely serrate, 

 cherry-like: fruit a small thin-fleshed shining plum on 

 a long pedicel. Delaware, south ; also in cultivation. 



Cherries : fla-ers in umbel-like clusters : fruit 

 small and nearly globular, early -ripening, usu- 

 ally without a prominent suture and '^bloom," the 

 stalk slender. 

 ' P. C6ra8U8, Linn. Sour cherry. Round-headed 

 tree, with flowers in small clusters from lateral buds: 

 480. Prunus Avium leaves hard and stifiBsh, short-ovate or obovate, gray- 

 ish green, serrate: fruit small, sour. Europe. 

 P. Avium, Linn. Siceet cherry. Fig. 480. Straight grower, the "leader" 

 prominent in young trees, with flowers in dense clusters from lateral spurs: 

 leaves oblong-ovate, dull and soft, on the voung growths hanging : fruit 

 usually rather large, sweet. Europe. 



aaaa. Wild cherries, with small, scarcely edible fruits: 

 flowers umbellate or racemed. 



P. Pennsylvdnicum, Linn. Wild red cherry. Pin or bird cherry. Small 

 tree, 20-30 ft. high, with red-brown, peeling bark: flowers small, white, on 

 long pedicels in umbel-like clusters, from lateral scaly buds, in early spring, 

 before or with the leaves: fruit very small, globose, red, smooth, with thin, 

 sour flesh. 



P. Virginiana, Linn. Choke cherry. Small tree or shrub, 5-20 ft., with 

 grayish spotted bark: leaves thin, oval or obovate, abruptly acute at tip, 

 sharp-serrate: flowers white, in short racemes, terminating leafy branches, 

 appearing after leaves in late spring: fruit small, globose, red changing to 

 dark crimson (nearly black), very astringent: usually found along banks 

 and in thickets. 



P. serdtina, Ehrh. Wild black cherry. Tree 50-80 ft., with black, rough 

 bark and reddish brown branches; leaves thickish, oblong or oblong-lanceo- 



