ACERACEAE. 125 



20. Buds glabrate, green or red with rather fleshy 



scales. 21. 

 Buds gray-pubescent. 48. 



21. Buds small (scarcely 5 mm.). 22. 



Buds large (the terminal 5 mm. or more), solitary. 32. 



22. Buds not becoming multiple. 23. 

 Buds becoming multiple. 24. 



23. Leaves ovate, scarcely lobed. A. tataricum. 

 Leaves with a middle and two lateral lobes. A. ginnala. 



24. Bark flaking in age : lobes of leaves widened upwards : 



flowers without petals. (Silver maple). 25. 

 Bark not flaking : lobes of leaves narrowed upwards : 

 flowers with red petals, fragrant. (Red maple). 31. 



25. Leaves not variegated. 26. 



Leaves pale-mottled. A. saccharinum albo-variegatum. 



26. Not weeping. 27. 



Weeping : leaves laciniate. A. saccharinum Weirii. 



27. Leaves green. 28. 



Leaves yellow. A. saccharinum lutescens. 



28. Leaves with broad lobes. 29. 

 Leaves laciniate. 30. 



29. Lobes moderately separated. A. saccharinum. 

 Lobes very deeply separated. A. saccharinum tripartitum. 



30. Lobes flat. A. saccharinum heterophyllum. 

 Lobes crisped. A. saccharinum crispum. 



31. Tree round or ovoid. A. rubrum. 

 Tree oblong-pyramidal. A. rubrum columnare. 



32. Leaf-scars meeting: sap milky. (Norway maple). 33. 

 Leaf-scars not meeting : sap not milky. 43. 



33. Leaves not variegated. 34. 

 Leaves variegated. 40. 



34. Leaves green. 35. 

 Leaves red or purple. 38. 



35. Tree round-topped. 36. 



Tree oblong. A. platanoides columnare. 



36. Leaves broad-lobed. 37. 



Leaves deeply dissected, A. platanoides dissectum. 



