Philonotis americana Dismier, Mém. Soc. Bot. France 17: 35. 1910

Plants large. Stems 5-16 cm. Leaves with distalmost spiraled around stem, catenulate, spreading, distant, broadly ovate-lanceolate, sometimes falcate, pluriplicate. Capsule 2.5-3.5 mm.

Capsules mature Jun-Sep. Seeps, exposed slopes, mountain meadows; low to high elevations (0-3000 m); Alta., B.C., N.B., Ont., Que.; Alaska, Calif., Colo., Idaho, N.Y., Oreg., Utah, Wash.

Variety americana, which includes the largest plants of the genus in North America, can be recognized by its robust habit, distant, catenulate leaves, and distalmost leaves spiraled around the stem.