ROSACEAE. 



95 



4. 8. laevigata. Schneider, f. 133. 8. media. Schneider, f. 

 176. 8. prunifolia. Bosemann, 76; Shirasawa, 247. S. sali- 

 cifolia. Bosenianq, 76; Willkomm, 37, f. 57. 

 1. Buds with 2 valvate scales. 2. 



Buds with several exposed scales when mature. 3. 



2. Buds short. 

 Buds long and slender. 



3. Buds conical: twigs-terete, slender 

 Buds ovoid, or else shrubs low. 4. 



4. Buds often collaterally multiplied. 

 Buds solitary. 5. 



5. Twigs glabrous. 6. 

 Twigs pubescent. 10. 



6. Twigs terete. 7. 



Twigs more or less distinctly angled. 



7. Twigs dark: buds elongated. (3) 

 Twigs bright red-brown. 



8. Angles evanescent: rather low and 

 Angles pronounced: tall and bushy. 



9. Vestiges of inflorescence corymbose 

 Vestiges of inflorescence paniculate. 



S. canescens. 



S. longigemmis. 



(1). X S. Vanhouttei. 



(2). S. prunifolia. 



8. 



X S. cantoniensis. 

 S. corymbosa. 

 simple. 9. 



S. chamaedryfolia. 



S. betulaefolia. 



(4). S. latifolia. 



10. Pubescence gray or merely dingy, usually velvety. 11. 

 Pubescence often rusty and woolly. (5). S. tomentosa. 



11. Twigs more or less distinctly angled. 12. 



Twigs terete: inflorescence corymbose. S. japonica. 



12. Twigs neither excessively slender nor numerous. 13. 



13. 



11. 



15. 



