Pterostylis auriculata

Detailed description

Terrestrial, glabrous, tuberous summer-green perennial. Plant erect, all parts distinctly glossy, up to 380 mm tall. Stems bright-red to reddish green. Leaves 4, all cauline, of more or less equal length, usually overtopping the galea, 125–180 × 10–12 mm, pale-green to dark green, lanceolate, distinctly acuminate, arching with apices drooping, widest near sessile sheathing base, midrib prominent, reddish. Flower solitary, narrowly erect, green with a reddish tint. Ovary slender, 10 mm long, reddish, linear-ellipsoid. Dorsal sepal 15–18 mm long, narrowly ovate, shortly acuminate. Lateral sepals erect, narrowly divergent, sinus large, apices caudate, 8–9 mm long, overtopping galea, spreading, narrow and more or less falcate caudae. Petals narrowly ovate, shortly acuminate. Labellum 10 × 2.3–4.6 mm, dark-red, linear-oblong, distinctly arched and tapering toward the truncate or slightly retuse to emarginate apex, midrib prominent, keeled below, deeply depressed above, somewhat twisted, with 4 flexuous lateral veins on each side; basal callus wide, shortly curved, and coarsely fimbriate. Column slender about as long as labellum, wings prolonged upwards as subulate apices nearly 2.3 mm long, narrow auriculate; auricles 4.5 mm long, with the apices closely and finely ciliate.