Flowering plant to 30 cm tall, stem leaves 3–4, closely sheathing. Rosette leaves 8–12, elliptic to ovate, 2–4 cm long, 6–11 mm wide. Flowers 2–8, porrect, c. 2 cm long, transparent with reddish brown stripes and suffusions; dorsal sepal with straight or upcurved filiform point 10–15 mm long; lateral sepals deflexed, conjoined part broadly ovate in outline when flattened, shallowly concave to nearly flat, margins slightly upcurved, densely ciliate, free points filamentous, 20–30 mm long, deflexed, more or less parallel to spreading, c. 20 mm apart at the tips; petals with a poorly developed proximal flange. Labellum ovate, 6–7 mm long, 3–3.5 mm wide, brown, thin-textured, marginal hairs 9–12 pairs, c. 1 mm long, white, spreading; basal lobe sloped backwards, with 2 prominent, forward-pointing hairs 3–4 mm long. Flowers Oct.–Nov.
LoM, MuM, Wim, VRiv, RobP, Gold, GGr, DunT, NIS, HSF. In Victoria, known from the Sunset Country and Annuello in the far north-west, and near Swan Hill. Occurs in mallee scrub on sandy soils.
Victorian populations were formerly considered to be a distinct entity, 'P. sp. aff. biseta (Pink Lakes)', but Reiter et al. (2021) have shown that they are indistinguishable from 'typical' P. biseta.
