130 
9. 
10. 
Ta; 
12. 
13. 
14. 
15. 
16. 
1%, 
18. 
19. 
20. 
21. 
22. 
ROSACEAE. 
Buds round-ovoid, spreading. P. Mahaleb. 
Buds oblong, appressed, glabrous. P. Padus. 
Buds dull brown, ovoid: scales rough. (3). P. virginiana. 
Buds clear brown or glossy. 11. 
Buds conical, light brown. P. Maackii. 
Buds ovoid. 12. 
Buds small (2x4 mm.), glossy: seales rather fleshy. 
(Wild black cherry). P. serotina. 
Buds large (35-7 mm.). 13. 
Buds glossy, ovoid-fusiform. 
(Sweet cherry). (4). P. avium. 
Buds duller or darker, round-ovoid. 
(Sour cherry). P. Cerasus. 
Buds scarcely longer than thick. 15. 
Buds elongated. 16. 
Buds half-covered by the ciliate leaf-cushion, twigs slen- 
der, red. (Southern plum). (5). P. angustifolia. 
Buds protruding: twigs velvety, very spiny. P. spinosa. 
Buds broadly ovoid. 17. 
Buds ovoid-fusiform. 19. 
Buds dark: scales ciliate. (Apricot). P. Armeniaca. 
Buds light brown, puberulent. (European plums). 18. 
Twigs glabrous. P. domestica. 
Twigs velvety. P. insititia. 
Twigs velvety. 20. , 
Twigs glabrous. 21. . 
Low and spreading: buds velvety. P. maritima. 
Tall. P. americana mollis. 
Buds velvety: twigs slender. (7). P. cerasifera. 
Buds glabrous: twigs stouter or stiff. (Wild plums). 22. 
Buds red-brown, short (3-4 mm.). (6). P. americana. 
Buds black or gray, large (4-5 mm.) and subconical. 
P. nigra. 
