ROSACEAE. 95 
4— 8. laevigata. Schneider, f. 133.—S. media. Schneider, f. 
176.—S. prunifolia. Bosemann, 76; Shirasawa, 247.—S. sali- 
cifolia. Bosemann, 76; Willkomm, 37, f. 57. 
i 
2. 
3. 
14. 
15. 
Buds with 2 valvate scales. 2. 
Buds with several exposed scales when mature. 3. 
Buds short. S. canescens. 
Buds long and slender. S. longigemmis. 
Buds conical: twigs terete, slender. (1). x S. Vanhouttei. 
Buds ovoid, or else shrubs low. 4. 
. Buds often collaterally multiplied. (2). S. prunifolia. 
Buds solitary. 5. 
. Twigs glabrous. 6. 
Twigs pubescent. 10. 
. Twigs terete. 7. 
Twigs more or less distinctly angled. §8. 
. Twigs dark: buds elongated. (3). « S. cantoniensis. 
Twigs bright red-brown. S. corymbosa. 
. Angles evanescent: rather low and simple. 9. 
Angles pronounced: tall and bushy. S. chamaedryfolia. 
. Vestiges of inflorescence corymbose. S. betulaefolia. 
Vestiges of inflorescence paniculate. (4). S. latifolia. 
. Pubescence gray or merely dingy, usually velvety. 11. 
Pubescence often rusty and woolly. (5). S. tomentosa. 
. Twigs more or less distinctly angled. 12. 
Twigs terete: inflorescence corymbose. S. japonica. 
. Twigs neither excessively slender nor numerous. 13. 
Twigs filiform. (6). S. Thunbergii. 
. Inflorescence corymbose. 14. 
Inflorescence paniculate. 15. 
Stems slightly glaucous. S. virginiana pubescens. 
Stems not glaucous. < S. Bumalda. 
Pubescence abundant. S. Douglasii. 
Pubescence scanty. S. alba. 
