Plants 10–100 cm or more. Leaves few–several, ascending, scattered along stem, gradually reduced to bracts distally; blade oblong to linear-lanceolate, 5–30 × 0.6–7 cm. Spikes very lax to very dense. Flowers resupinate, not showy but sometimes conspicuous, whitish green; corolla often whiter than calyx; lateral sepals spreading to slightly reflexed; petals ovate-to lance-falcate, margins entire; lip descending or apex adhering to dorsal sepal and petal apices, lanceolate to nearly linear, without basal thickening, 5–12 × 2–4 mm, base slightly to rather markedly rounded-dilated, margins entire; spur slenderly cylindric to clavate, 4–12 mm, apex usually slenderly tapered; rostellum lobes divergent, directed downward, very small, obscure, rounded; pollinaria straight; pollinia remaining enclosed in anther sacs; viscidia oblong; ovary rather slender to stout, mostly 6–15 mm. 2n = 84.
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