158 Proceeding's of the Ohio State Academy of Science 



Leaves ovate, or obovate sharply and often doubly serrate, 

 rounded at the base, slender-petioled. Drupe with a tough skin, 

 globose, red or yellowish, edible. Often used as a stock on which 

 to graft domestic plums. Wood hard, reddish in color. N. Y. 

 to Mont., Fla., Colo., and Ohio. 



2. Prunus nigra Ait. Canada Plum. A tree with thin 

 bark. Leaves oval, ovate, or obovate, long-acuminate, crenulate- 

 serrate; drupe oval, orange-red, thick-skinned, with little or no 

 bloom. Petals pink in age. Newf. to Man., Mass. and Wis. 



3. Prunus hortulana Bail. Wild-goose Plum. A small 

 tree with spreading branches and thin bark. Leaves ovate-lanceo- 

 late to ovate, long-acuminate, closely glandular-serrate. Drupe 

 bright red and thin-skinned, edible. 111. to Kan., Tenn., and Tex. 



4. Prunus angustifolia Marsh. Chickasaw Plum. A 

 small tree with thorn-like stunted branches. Leaves acute, ser- 

 rulate, often rounded at the base. Drupe globose, red, and edi- 

 ble. In dry soil. N. J. to Fla., west to Rocky Mts. 



*. Prunus douicstica L. Common Garden Plum. A small 

 tree with about 100 cultivated varieties. Drupe of various colors, 

 covered with a thick glaucous bloom. 



5. Prunus alleghaniensis Port. Alleghany Plum. A low 

 shrub or small tree, seldom thorny. Leaves acute or acuminate, 

 finely serrate, rounded at the base. Drupe pleasantly acid, glo- 

 bose-ovoid, with a conspicuous bloom. Penn. 



Cherries. 



6. Prunus cerasus L. Sour Cherry. A small tree with 

 globose, red or reddish-black, sour, edible drupes. Leaves ovate 

 or ovate-lanceolate, abruptly acute or acuminate, rounded at the 

 base, very resinous when young. Self-prunes the fruiting branch- 

 lets. Native of Europe. N. H. and Mass. to N. Y. and Ohio. 



7. Prunus avium L. Sweet Cherry. A medium-sized 

 tree with globose, black or dark red, sweet, edible drupes. Leaves 

 ovate, oval, or slightly obovate, abruptly short-acuminate, irregu- 

 larly serrate. Native of Europe. Ont. to Mass., Ohio and Va. 



8. Prunus pennsylvanica L. f. Red Cherry. A small 

 tree with sour globose, red drupes. Leaves oval or lanceolate, 



