Manual, 473. 1848.
Plants 35–105 cm. Leaves 2–5, spreading to ascending, scattered along stem, gradually reduced to bracts distally; blade lanceolate, elliptic, oblongelliptic, or oblance-oblong, 7–27 × 1.2–5 cm. Spikes lax to dense. Flowers resupinate, showy, rose-purple; lateral sepals somewhat reflexed; petals oblong-linear to spatulate, distally crenate to entire; lip descending to somewhat porrect, deeply 3-lobed, without basal thickening, 11–20 × 12–23 mm, distal margins of lobes dentate-lacerate, rarely nearly entire, lateral lobes narrowly cuneate, middle lobe broadly cuneate-flabellate, emarginate to 2-fid; spur clavate, 20–30 mm; rostellum lobes directed forward, spreading, angular; pollinaria straight to geniculate; pollinia directed forward; viscidia orbiculate; ovary slender, 13–23 mm.
Phenology: Flowering (Jun–)Jul–Aug(–Oct).
Habitat: Alluvial forests, wet wooded flats, stream banks, seeping slopes, marshes, moist prairies, old fields and pastures, ditches, thickets
Elevation: 0–800 m
Ala., Ark., Del., Ga., Ill., Ind., Ky., Md., Miss., Mo., N.J., N.C., Ohio, Pa., S.C., Tenn., Va., W.Va.