Habenaria chorisiana Chamisso, Linnaea 3: 31. 1828; Limnorchis chorisiana (Chamisso) J. P. Anderson; Pseudodiphryllum chorisianum (Chamisso) Nevski

Plants 4–20(–30) cm. Leaves (1–)2(–4), spreading, subopposite toward base of stem; bracts (0–)1(–2) distally; blade elliptic, lanceolate, to suborbiculate, 2–9 × 0.9–4 cm. Spikes rather lax to dense. Flowers incompletely resupinate, inconspicuous, greenish; lateral sepals porrect; petals broadly ovate, margins entire; lip projecting forward, concave, orbiculate, ovate, or elliptic, without basal thickening, 1.5–2.5 × 1.2–2 mm, margins entire; spur stoutly cylindric to saccate, obtuse, 0.7–1.25 mm; rostellum lobes spreading, directed downward, minute, obscure; pollinaria straight; pollinia evidently remaining enclosed in anther sacs; viscidia oblong to suborbiculate-quadrangular; ovary rather stout, mostly 2–4 mm. 2n = 42.

Flowering Jul--Aug. Wet tundra, meadows, bogs; 0--400 m; B.C.; Alaska, Wash.; Asia (Kamchatka to Japan).