Plants 150–45 tall. Free part of leaf to 120 x 2–3mm, stiff to rigid. Spike 80–18 long, narrow, 15–30-flowered. Ovary sessile, green shiny, projecting at wide angle. Flowers widely spaced, 8–9 x 4mm, pale green with reddish or purplish markings, labellum green with reddish or purple margins, callus light green (sometimes wholly green flowers with red labellum). Dorsal sepal 4.5–5 x 1.8–2.2mm, decurved. Lateral sepals fused basally then free, 5.5–6 x 1.2mm, with short terete tips. Petals 3.5 x 1. porrect. Labellum shortly stalked, ovate, sharply recurved near middle, 3.2–3.5 x 2mm, margins slightly crinkled. Callus prominent, extending nearly to labellum apex where very slender.
Locally common, growing in swamps, seepage areas and seasonally wet flats, often flowering while plants partly submerged.
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