KEY TO THE SPECIES OF CHERRIES, PLUMS, 

 AND PEACHES 



1. Frxiit usually over H inch in diameter and usually slightly 2-lobed 

 by ventral groove. 



2. Terminal bud present; fruit and ovary hairy; natvu-alized 



P. persica, Peach, p. 259. 



2. Terminal bud absent; fruit and ovary glabrous Plums 



3. Leaves rolled up in bud; flowers 1 or 2; naturalized. 



4. Twigs glabrous; fruit 1 inch across 



P. domestica. Garden Plum, p. 265. 



4. Twigs hairy or woolly; fruit about ]4 inch across. 



5. Flowers single; buds round P. spinosa L., Sloe 



5. Flowers in 2s; buds ovate 



P. insititia, Damson Plum, p. 265. 



3. Leaves folded in bud (except Klamath Plum); flowers 3 to 

 many; native. 



6. West Coast; leaves round-ovate, rolled in bud 



P. subcordata Benth., Klamath Plum 



6. East of Pacific Coast; leaves ovate to lanceolate. 

 7. Leaves with sharp teeth, dull dark green above. 



8. Leaves lanceolate to elliptic; fruit pxirple, glaucous. 

 9. Fruit stone turgid; calyx hairy; Connecticut to 



North Carolina 



P. alleghaniensis Port, Allegheny Plum 



9. Fruit stone flattened; calyx glabrous; North Caro- 

 lina to Texas and Arkansas 



P. umbellata Ell., Flatwoods Plum 



8. Leaves oblong to obovate; fruit red to yellow; stone 

 flattened. 



10. Leaves hairy below; twigs hairy; central and south 

 P. mexicana Wats., Mexican Plum 



10. Leaves nearly glabrous below; twigs glabrous; 

 Canada to Florida, west to the Rocky Mountains 



P. americana, American Plum, p. 265. 



7. Leaves with dull, rounded teeth. 



11. Leaves dull green, elliptic to obovate, coarsely or 



doubly toothed; stone flattened 



P. nigra Canada Plum, p. 265. 



11. Leaves lustrous, thin, ovate to lanceolate, finely 

 toothed; stones turgid; southern Indiana to Kansas 

 and south. 



12. Leaves 2 3^-6 inches long; fruit M-1 inch; calyx 

 glandular. 



13. Leaves oblong to obovate 



P. hortulana Bail, Hortulan Plum 



13. Leaves elliptic to lanceolate 



P. munsoniana W. & H., Wildgoose Plum 

 12. Leaves 1-2 inches long; fruit }4 inch; calyx lobes 



without glands 



P. angustifolia Marsh, Chickasaw Plum 



I. Fruit seldom }i inch across, not lobed; leaves folded in bud; terminal 



bud present Cherries 



14. Flowers solitary or few, in umbels or corymbs. 

 15. Calyx persistent on fruit; naturalized. 



16. Leaves thin, 2 H-5 inches long, hairy below at least along 

 veins; fruit sweet. . .P. avium, Mazzard Cherry, p. 259. 



16. Leaves semi -leathery, 2-3 inches long, glabrous; fruit sour 

 P. cerasus L., Sour Cherry, p. 259. 



15. Calyx deciduous from fruit. 



17. Leaves orbicular to broad ovate; naturalized 



P. mahaleb L., Mahaleb 



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