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Key to Nasturtium
https://fsus.ncbg.unc.edu/main.php?pg=show-key.php&keyid=40186
1 Petioles of emergent leaves lacking auricles toward the base; seeds yellowish-brown, finely reticulate, with 400-500 polygonal depressions on each side | |
1 Petioles of emergent leaves auriculate toward the base; seeds reddish-brown, rather coarsely reticulate, with 25-150 (-175) polygonal depressions on each side. | |