Most moist areas. Perennial, tufted herb with creeping rhizomes. Erect or ascending, branched or unbranched, up to 10 inches long, smooth or sparsely hairy. Opposite, simple, ascending, linear-lancolate, up to 1 inch long, pointed at the tip, tapering to the base, smooth, without teeth. Ovary superior, smooth.
Capsules narrowly ovoid, dark brown, longer than the sepals, smooth.