Glabrous or subglabrous perennial 1–4 dm; basal lvs spatulate, 1–3 cm, sometimes immersed, often deciduous; cauline lvs mostly linear, 1–5 cm × 1–5 mm; racemes loose, sometimes secund; bracts linear or filiform, the lower to 15 mm; pedicels bibracteolate at or above the middle; sep 2–3 mm; cor 7–13 mm, blue to partly or wholly white, the lower lip glabrous; 2n=14. Calcareous shores and swamps; Nf. to B.C., s. to Pa., O., Ill., and Minn. July, Aug. (L. strictiflora)
Wet limestone shores and bogs. Fens (calcium-rich wetlands), wet meadows, ridges or ledges, shores of rivers or lakes.
Can be grown by seedlings. Seeds needs stratification.
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