92 ACER ACE AE 



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 in early winter. 24. 



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

 Leaved with a middle and two lateral lobes 1 . 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: fetid. 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: not fetid. 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. 



37. Lobes moderately separated. A. platanoides. 

 Lobes separated nearly to base. A. platanoides laciniatum. 



