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Key to Polytaenia
https://fsus.ncbg.unc.edu/main.php?pg=show-key.php&keyid=41045
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] |