Coefficient of Conservatism:
Coefficient of Wetness:
Forests and thickets, neither the wettest nor the driest but ranging from cedar swamps to aspen forests, usually with conifers (most often cedar); especially common at borders (as along shores or on old dunes), openings, and clearings; very local southwards in the state, often abundant northward.
Plants of Eurasia and parts of Alaska represent the subsp. borealis or var. borealis; ours may be called var. longiflora Torr. or subsp. longiflora (Torr.) Hultén.
Rarely the flowers are solitary or more than two. Occasional late-blooming individuals (September) tend to have an extra flower on the peduncle, below the usual pair.