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1 Leaves whorled, most nodes with 3 or more leaves. | |
3 Leaves tipped by a callus (visible at 10× magnification); leaf margins entire; flowers many, grouped in a terminal involucrate head; [Eudicots] | |
4 Cauline leaves in 2-many nodes. | |
5 Leaves in 2-3 pairs, appearing verticillate; plants of marine waters; [of FL, MS, LA and southward] | |
5 Leaves along stem at 2-many nodes; plants of fresh to brackish waters; [collectively widespread]. | |
6 Flowers 3-merous; [Monocots]. | |
6 Flowers 4- or 5-merous; [Eudicots]. | |
8 Leaves 0.5-3 (-5) cm long; flowers solitary, axillary. | |
10 Leaves monomorphic, obovate, oblanceolate, or parallel-margined; corolla present (absent in Didiplis in LYTHRACEAE); stamens 2-6. | |
11 Flower radially symmetrical, 3-4-merous; petals absent or separate | |
11 Flower bilaterally symmetrical, 4-5-merous; petals present, fused at least basally, forming a tube. | |