206 
24. 
25. 
26. 
27. 
28. 
29. 
30. 
31. 
32. 
33. 
34. 
35. 
ACERACEAE. 
Twigs stout (4-6 mm.), green. 
(Oregon maple). A. macrophyllum. 
Twigs moderate or slender. 25. 
End-bud rather long (over 5 mm.). 
(Sycamore maple). A. pseudoplatanus. 
Buds distinctly smaller. 26. 
Exposed scales about 6: buds as thick as long, 
(Tartarian maples). 27. 
Exposed scales about 8. (Field maples). 28. 
Buds blackish: twigs dark. A. tataricum. 
Buds red-brown or paler. A. Ginnala. 
Buds gray-woolly, at least above. A. campestre. 
Buds glabrate, becoming dark. A. monspessulanum. 
Buds glabrous. 30. 
Buds more or less silky or hairy and dull. 31. 
Buds stout, prismatic: end-bud often lacking. 
A. carpinifolium. 
Buds fusiform, terete, very acute. A. mandshuricum. 
Twigs loosely hairy above. ; A. nikoense. 
Twigs glabrescent. 32. 
Twigs 3-4 mm. thick: buds 10 mm. long. A. diabolicum. 
Twigs slenderer and buds smaller. 383. 
Buds moderate (the terminal 5 mm. long). 34. 
Buds small (scarcely 2X3 mm.). 35. 
Twigs and buds dull straw-color, hairy. 
(Black maple). A. nigrum. 
Twigs glossy buff: buds darkening, glabrate. 
(Sugar maple). (4). A.saccharum. 
Bark of trunk finally rough. A. floridanum. 
Bark persistently smooth and white. A. leucoderme. 
