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1 Leaves lanceolate, narrowly elliptic-lanceolate, or narrowly oblong, 5-60 mm wide, mostly 1.5-10× longer than wide, mid-cauline leaves usually with well-developed petioles 5-20+ mm long (except in L. lanceolata where petioles are mostly <5 mm long). | |
6 Plants lacking creeping rhizomes; stem bases usually somewhat swollen and >4 mm in diameter, often with adventitious roots; leaf bases mostly rounded to broadly cuneate; petioles ciliate mostly only in basal half but sometimes with a few cilia extending into distal half of petiole; plants of wetlands | |
7 Stems erect or sometimes reclining on other vegetation but not prostrate and rooting at the nodes; corolla lobes 5-12 mm long. | |
8 Cilia extending up proximal half of petioles; plants of wetlands to mesic forests; stem bases usually somewhat swollen and often with adventitious roots | |
9 Leaves narrowly lanceolate, bases cuneate and generally gradually contracted to the petiole, widest point located near the middle to just below the middle of the blade, 4-9× longer than wide, mid-cauline leaves 5-12 mm wide | |
9 Leaves ovate to ovate-lanceolate, bases rounded to truncate, abruptly contracted to the petiole, widest point located in the proximal one-quarter to one-third of the blade, 1.5-4.5× longer than wide, mid-cauline leaves 15-44 mm wide |