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1 Petiole with lateral flap margins fimbriate; leaves of each opposite pair distinctly unequal in size
....3 Inflorescence bracts 2 (1 pair), each ca. 1 mm long; [rare waif]
....3 Inflorescence bracts 4-6 (in 2-3 pairs), each bract ca. 5 mm long; [native, s. MS westwards]
......4 Flowers and fruits on pedicels (3-) 5-20 mm long; plants perennial, rooting at nodes; styles and locules 5.
........5 Seeds smooth, ca. 1 mm long; capsule ovoid, as long as or shorter than the perigone; [widespread in our area]
........5 Seeds wrinkled, ca. 1.5 mm long; capsule tapered, slightly longer than the perigone; [coastal TX (Kenedy County)]