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Click the number at the start of a key lead to highlight both that lead and its corresponding lead. Click again to show only the two highlighted leads. Click a third time to return to the full key with the selected leads still highlighted.

Key to Ampelopsis

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1 Leaves bipinnate to tripinnate, with > 11 leaflets; [native and alien species]
1 Leaves simple and palmately veined (grape-like), or palmately 5-foliolate (the leaflets additionally pinnately lobed); [alien 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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