Lvs small, mostly subterranean, seldom seen; nodes mostly 6–14; roots finely branched, with minute bladders; flowering branches green to yellow-green, erect, straight, 10–25 cm; fls 1–6, all chasmogamous; bracts ovate, 1–2 mm, facing the axis; bractlets 2, edgewise to the axis, facing each other, oblong, acute; pedicels 1–2 mm; fls yellow, the spur 7–14 mm, directed downward, the lower lip 9–16 (avg. 13) mm, with greatly elevated palate surrounded by a spreading margin; 2n=18. Wet shores; Nf. and Que. to n. Mich. and Minn., s. to Fla. and Tex.; W.I. July, Aug. (Stomoisia c.)
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