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Key to Rotala
https://fsus.ncbg.unc.edu/main.php?pg=show-key.php&keyid=40102
1 Leaves opposite, of one type, linear to oblanceolate or oblong, most > 3× as long as wide; inflorescences terminal racemes, axillary racemes, or axillary single flowers. | |
2 Leaf margins white-cartilaginous; flowers mostly aggregated into axillary spikes or racemes or terminal racemes (rarely some on a plant axillary single flowers) | |