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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 J1: woody plants with opposite, simple, palmately or pinnately lobed leaves

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1 Leaves pinnately lobed.
..2 Leaves harshly scabrous on the upper surface; leaves typically a mix of alternate, opposite, and whorled
..2 Leaves glabrous or glabrescent on the upper surface; leaves strictly opposite
1 Leaves palmately lobed.
....3 Plants climbing by twining; stems with retrorse prickles; foliage scabrous
....3 Plants erect trees or shrubs; stems not prickly; foliage smooth or pubescent, but not scabrous.
......4 Leaves 3-9-lobed, the margins generally serrate or sublobed; fruit either a drupe or a schizocarp of 2 samaroid mericarps (maple “keys”).
........5 Fruit a schizocarp of 2 samaroid mericarps (maple “keys”); stamens (4-) 8 (-12); small to large trees; petioles >1× as long as the leaf blade
........5 Fruit a drupe; stamens 5; shrubs; petioles < ¾× as long as the leaf blade
......4 Leaves 3-lobed, the margins entire; fruit a capsule.
..........6 Flowers white to yellow; capsules linear, >10× as long as wide; leaf undersurface with curly simple hairs; nectar glands present in the main vein axils on the undersurface of the leaf (visible from the underside or the upperside in fresh leaves and herbarium specimens)
..........6 Flowers lavender; pods ellipsoid, < 2× as long as wide; leaf undersurface with branched (dendritic) stellate hairs; nectar glands absent
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