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Perennial herb, with annual erect stems becoming prostrate and rooting at nodes, 0.03-0.50 m long. Leaves nearly glabrous to densely pilose, very narrowly to broadly ovate to obovate, apex acute to obtuse, base cuneate; petiole 0-4 mm long. Inflorescence of axillary elongated spike-like cymes, usually single at each node, peduncles slender, 5-47 mm long, with 2-4 flowers towards end. Flowers subsecund, sessile, solitary at each inflorescence node. Bract subulate, 1, with another on oppposite side of axis, up to 4 mm long. Bracteoles 2, similar to bract. Corolla (5)6-8 mm long, white, with or without maroon lines on palate. Pollen 2-porate, 28-36 µm long, sexine areolate. Capsule 4-seeded, glabrous or with a few hairs near apex, delicate, up to 8 mm long.
Perennial herb. Stems annual; erect becoming procumbent, up to 0.5 m long; rooting at nodes. Leaves petiolate; blade narrowly to broadly ovate to obovate, up to 20 x 10 mm, base cuneate, apex acute to obtuse, glabrous to densely pilose; petioles up to 4 mm long. Flowers: 2-4, sessile in an elongated, spike-like cyme, single at a node; calyx glabrous on inside; corolla 5-8 mm long, white with or without maroon lines; Aug.-May. Fruit 1-seeded, hard, up to 17 mm long.
Perennial, erect herb becoming prostrate. Inflorescence of long-pedunculate, elongate cymes, axillary, single at each node. Flowers sessile, corolla (5-)6-8 mm long. Flowers white with or without maroon lines.
