PRUNUS 



a. Terminal bud present 



b. Twigs red or green; buds hairy 



b. Twigs brown or gray 



c. Twigs more or less velvety 

 c. Twigs glabrous 



d. Buds dull brown, ovoid; scales 



rough 

 d. Buds clear brown or glossy 



e. Buds small, 2-4 mm. long 



f. Buds 4 mm. long; scales 

 chestnut-brown, keeled 



f. Buds 2 mm. long; scales 

 red-brown, ciliate 



e. Buds larger, 5-7 mm. long 



f. Buds ovoid -fusiform, 



glossy 

 f. Buds round -ovoid, duller 



or darker 



a. .Terminal bud deciduous 



123 

 6. P. persica 



10. P. mahaleb 



12. P. virginiana 



11. P. serotina 



7. P. pensylvanica 



8. P. avium 



9. P. cerasus 



b. Buds about as long as thick 

 b. Buds elongated 



0. Twigs velvety, becoming glabrate 

 c. Twigs glabrous 



d. Armed with spine-tipped twigs 



e. Buds 3-6 mm. long; small tree 

 e. Buds 2 mm. long; usually a 

 low straggling shrub 



5. P. angustifolia 



1. P. maritima 



3. P. americana 



2. P. alle- 

 ghaniensis 



d. Unarmed 



e. Buds large, sometimes 10-12 



mm. long; tree 

 e. Buds small, 2 mm. long; shrub 



4. P. hortulana 

 2. P. alle- 



ghaniensis 



1. P. maritima Marsh. Beach Plum. Low and straggling or 

 ascending shrub 0.3-2.5 m. high, densely branched ; twigs at 



