Pterostylis agrestis
(D.L.Jones) G.N.Backh.Flowering plant 5–12 cm tall, stem leaves 4–6, closely sheathing to spreading. Rosette leaves 5–8, ovate to elliptic, 0.6–2 cm long, 3–8 mm wide, shortly petiolate, crowded, margins entire. Flowers 3–14, 8–10 mm long, translucent green with darker green lines; galea porrect at base, shallowly curved for most of its length, abruptly decurved near the apex; dorsal sepal acute; lateral sepals deflexed, conjoined part broadly ovate in outline when flattened, 5–6 mm long, 6–7 mm wide, margins incurved, concave, free points broadly triangular, c. 3 mm long, spreading; petals asymmetrical, ovate, broadest towards the middle. Labellum green with a greenish black basal appendage; lamina oblong to obovate, 2–2.2 mm long, c. 2 mm wide; appendage c. 2 mm long, c. 1.3 mm wide, 3-ridged, central ridge hardly higher than marginal ridges. Flowers Sep.–Oct.
VVP, Gold, CVU, GGr. Endemic to Victoria where confined to basalt plains grasslands in the vicinity of Bacchus Marsh, Maldon, Sutton Grange, Taradale and possibly Woorndoo.
Easily confused with Pterostylis bicolor, but that species favours woodlands and coastal scrub, is generally more robust with widely spaced non-overlapping flowers. The closely related P. clivicola is a montane species that has an elliptical labellum and a more elevated central ridge on the labellum appendage.
This species is poorly known and seldom collected.