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Perennial or sometimes biennial, amphibious herb from a shallow creeping rhizome, smooth throughout, sometimes glandular; stems sprawling or decumbent to ascending, 10-60 (100) cm long/tall, rooting at the lower nodes, simple to much-branched at the base, somewhat fleshy, often purple-tinged.
Opposite, mostly unstalked, somewhat clasping-based, lanceolate to oblong, 2-6 (9) cm long, 3-5 times as long as wide, entire or obscurely toothed.
Inflorescences several long, rather narrow, lax, opposite, stalked racemes arising from the axils of upper leaves, the racemes of 15 to 25 stalked flowers, the flower stalks straight and spreading, 3-7 mm long, slightly shorter than the reduced, broadly lanceolate bracts; corollas white to pink with darker lines or pale blue, saucer-shaped, 4-5 mm across, irregularly 4-lobed, the lobes much longer than the short tube, the lowest lobe narrower than the others; calyces about 3 mm long, deeply 4-lobed, the lobes unequal, broadly lanceolate to egg-shaped; styles 1.3-2 mm long, exserted; stamens 2.
Capsules, 2.5-3 mm long, a little wider than long, plump, somewhat globe-shaped, evidently notched at the tip; seeds numerous, flattened, 0.3-0.7 mm long.
Source: The Illustrated Flora of British Columbia