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Perennial herb from a stout, branched rhizome and long stolons; stems erect or ascending, several, simple or branched above, glabrous or nearly glabrous, forming large clumps, 30-90 cm tall.
Basal leaves lacking; stem leaves opposite, as many as 20 pairs, lanceolate to oblanceolate, 4-10 cm long, 1.5-4 cm wide, short-stalked or the upper ones unstalked; stipules lacking.
Inflorescence of numerous flowers in many tight clusters, fragrant, often double; petals 5, white to pink, stalklike at the base, stalk of the petals usually slightly exceeding the calyces, the blade mostly 10-15 mm long, egg-shaped to wedge-shaped with 2 linear appendages near the base, shallowly notched at the tip; sepals 5, green, united, forming a tube 15-20 mm long, with 5 teeth at the tip.
Oblong to narrowly egg-shaped capsules, to 25 mm long, 4- or 5-valved; seeds black, about 1.7 mm long, concentrically pimply.
Source: The Illustrated Flora of British Columbia