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Key to Ampelopsis

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1 Leaves bipinnate to tripinnate, with > 11 leaflets; [native and exotic species]
1 Leaves simple and palmately veined (grape-like), or palmately 5-foliolate (the leaflets additionally pinnately lobed); [exotic species].
  2 Leaves palmately 5-foliolate, the leaflets additionally pinnately lobed
  2 Leaves simple, grape-like, to 12 cm long and 9 cm wide.
    3 Leaves not lobed (to shallowly 3-lobed); young twigs green, glabrous
    3 Leaves 3-5 lobed; young twigs purplish, sparsely puberulent (sometimes becoming glabrate)
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