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1 Leaves whorled, most nodes with 3 or more leaves. |
..2 Leaves strongly toothed to pectinate |
..2 Leaves entire or finely toothed. |
....3 Leaves tipped by a callus (visible at 10× magnification); leaf margins entire; flowers many, grouped in a terminal involucrate head; [Eudicots] |
....3 Leaves not callus-tipped; leaf margins finely toothed or at least with conical protrusions remaining from the disintegration of better-developed deciduous teeth; flowers solitary on elongate, flexuous stalks; [Monocots] |
1 Leaves opposite, no nodes with 3 or more leaves. |
......4 Cauline leaves in 1 pair |
......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]. |
............ 7 Leaf margins (or at least leaf sheaths) serrate or minutely spiny; fruits sessile, entire; leaves 5-15× as long as wide |
............ 7 Leaf margins (including sheaths) entire; fruit stalked, dentate on one side; leaves >20× as long as wide |
..........6 Flowers 4- or 5-merous; [Eudicots]. |
............ ..8 Leaves 1-12 cm long; flowers borne in axillary or terminal spikes or clusters |
............ ..8 Leaves 0.5-3 (-5) cm long; flowers solitary, axillary. |
............ ....9 Carpels 4-5, separate; fruit an aggregate of follicles; leaves succulent |
............ ....9 Carpels 2-5, fused; fruit capsular (variously dehiscent); leaves thin in texture or somewhat succulent (e.g. Bacopa in PLANTAGINACEAE). |
............ ......10 Leaves dimorphic, the terminal leaves usually spatulate (strongly expanded towards the apex); corolla absent; stamen 1 |
............ ......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 |
............ ..........12 Stems lacking ridges running down from leaf bases |
............ ..........12 Stems with ridges running down from leaf bases |
............ ........11 Flower bilaterally symmetrical, 4-5-merous; petals present, fused at least basally, forming a tube. |
............ ............ 13 Corolla 4-merous |
............ ............ 13 Corolla 5-merous |