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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 Ptychosperma

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1 Stems solitary; leaflets ascending; endosperm ruminate
1 Stems clustered; leaflets horizontal in one plane on either side of the rachis; endosperm homogeneous