|
| 1 |
Leaves pinnately compound, usually trifoliolate |
|
Acer negundo |
| + |
Leaves simple, entire or lobed |
|
(2) |
| |
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|
| 2 (1) |
Leaves unlobed, ovate-lanceolate, persistent |
|
Acer oblongum |
| + |
Leaves palmately lobed, deciduous |
|
(3) |
| |
|
|
|
| 3 (2) |
Leaf margin serrate; lobes 3-5; petiole sap clear |
|
(6) |
| + |
Leaf margin entire, lobes 5-7; petiole sap milky |
|
(4) |
| |
|
|
|
| 4 (3) |
Primary lobes of leaves rounded to acute, margin
often ciliate |
|
Acer campestre |
| + |
Primary lobes of leaves acuminate, margin not
ciliate |
|
(5) |
| |
|
|
|
| 5 (4) |
Trees tall; twigs stout, 5-8 mm thick. Leaves mostly 5-lobed, 8-15 cm across. Inflorescence terminal |
|
Acer caesium |
| + |
Trees small; twigs 2-5 mm thick. Leaves mostly 3-lobed, 4-8 cm across. Inflorescence lateral |
|
(7) |
| |
|
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| 6 (3) |
Leaf lobes triangular, acute or blunt; margins subentire to remotely crenate-subserrate |
|
Acer pentapomicum |
| + |
Leaf lobes caudate-acuminate; margins acutely serrate |
|
Acer acuminatum |
|
