ROSACK.K. (ROSE FAMILY.) 131 



globose; stone slightly compressed. Dry light soil, Florida and Alabama 

 to South Carolina. Feb. - March. A shrub or .small tree. Branches purple, 

 shining. Leaves \' -\\' long. Plum rarely J' in diameter, dark purplish 

 or black, sour and bitter, ripening in August. 



3. P. Chicasa, Michx. Leaves thin, lanceolate or oblong-lauceolate- 

 acute, smooth, minutely and sharply serrate, with the teeth glandular ami 

 incurved ; flowers short-peduucled ; calyx smooth ; drupe yellowish red, glo- 

 bose. Old fields, forming thickets. March. A shrub or small tree. 

 Leaves IY~-' long. Plum about \' in diameter, thin-skinned and of an 

 agreeable flavor. 



4. P. gracilis, Gray & Engelm. Low and bushy, the pubescent branches 

 often spiny ; leaves short-petioled, ovate, acute, unequally serrate, glabrate 

 above, pale and villous beneath, l'-2' long; clusters 2 3-flowered ; calyx 

 pubescent; drupe globose, 6" -9" in diameter. Lookout Mountain, Tennes- 

 see (Gattinr/er), and westward. 



5. P. maritima, Wang. Low and straggling, spineless; leaves ovate or 

 obovate, acute or acuminate, sharply serrate, glabrate ; clusters few-flowered ; 

 drupe red or purplish, V in diameter. Alabama (Buckley). 



2. CERASUS. (CHERRY.) Drupe not glaucous: stone globular or slightly 

 compressed : leaves folded in the bud, deciduous. Spineless shrubs or trees. 



* Flowers clustered. 



6. P. Pennsylvanica, L. Leaves thin, ovate-lanceolate, acuminate, 

 finely and sharply serrate, green and smooth on both sides ; flowers several 

 in a cluster, on long peduncles; drupe globose, light red. Mountains of 

 North Carolina. May. A small tree. Fruit small and sour. 



* * Flowers in racemes terminating leafy branches. 



7. P. serotina, Ehrhart. Leaves smooth, varying from oval to ovate, 

 lanceolate, mostly acute or acuminate, serrate, with the teeth callous and 

 appressed ; racemes long, spreading; drupe globose, purplish black. Woods. 

 April - May. A tree 20 - 60 high. 



8. P. Virginiana, L. Smooth throughout, or the lower surface of the 

 leaves, branches, and racemes more or less pubescent; leaves thin, oval, 

 oblong or obovate, finely and sharply serrate, abruptly acute or acumi- 

 nate; racemes rather short and erect ; drupe red. Light sandy soil in the 

 upper districts. April. Shrub 3 -9 high. Leaves l'-3' long. Drupe 

 astringent. 



3. LAUROCERASUS. (CHERIIY LAUREL.) Drupe not glaucous : stone 

 globular : flotrers in racemes from i,'ic axils of evergreen leaves. 



9. P. Caroliniana, Ait. (Mocic ORANGE.) Leaves coriaceous, smooth 

 and glossy, ovate-lanceolate, acute, mostly entire ; racemes shorter than the 

 leaves, white; drupe ovoid, soon dry, black. Banks of rivers, Florida to 

 North Carolina, and westward. Feb.- March. A small tree. 



10. P. sphserocarpa, Swartz. Racemes small, erect, shorter than the 

 leaf; leaves elliptical, entire, shining; flowers scattered; drupe sub-globose. 

 Key Biscayne (Curtiss), South Florida. A small tree, 10 -15 high. 



