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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 Polytaenia

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1 Mature mericarps with lateral wings distinctly thickened, thicker than the face; oil tubes of dorsal face (6-) 8-10, laterally contiguous, covered by epidermis and pericarp and indistinct; oil tubes of commissural face 4, raised and distinct, a contiguous pair on each side of the midrib; [s. MI, WI, se. MN, and e. NE, south to KY, TN, AL, MS, e. LA, w. LA, ne. TX, and c. OK]
1 Mature mericarps with lateral wings relatively thin, same thickness as the face; oil tubes of dorsal face usually 4, raised and distinct; oil tubes of commissural face 2, raised and distinct, one on each side of the midrib; [s. OK south to e., se., and wc. TX]
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