Pterostylis incognita (D.L.Jones) G.N.Backh.

Victorian Naturalist 127: 57 (2010) APNI

Taxonomic status:Accepted

Occurrence status:Extinct

Establishment means:Native

Threat status:Victoria: extinct (x)

Flowering plant 8–13 cm tall, scape thick, stem leaves 3–5, closely sheathing. Rosette leaves 5–7, ovate to elliptic, 0.8–2 cm long, 4–11 mm wide, shortly petiolate, crowded, margins entire. Flowers 5–12, crowded, 8–10 mm long; 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, 4–5 mm long, 5–6 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-elliptic, 2–2.3 mm long, c. 2 mm wide; appendage c. 1.5 mm long, c. 0.8 mm wide, 3-ridged, central ridge thick, higher than marginal ridges. Flowers Sep.–Oct.

Endemic to Victoria where known only from the type collection near Sale presumably in grassland or grassy woodland.

Easily confused with Pterostylis bicolor, but that species is generally more robust with more widely spaced non-overlapping flowers. The closely related P. agrestis generally has a thinner scape and larger labellum appendage with a less elevated central ridge.

Apparently not collected for over 100 years and presumed extinct.

Created by: Jeff Jeanes, 2015-06-02
Updated by: Val Stajsic, 2018-02-15
Distribution map
life Life
kingdom Plantae
phylum Tracheophyta
superorder Lilianae
order Asparagales
family Orchidaceae
genus Pterostylis
Higher taxa


Source: AVH (2014). Australia's Virtual Herbarium, Council of Heads of Australasian Herbaria, <>. Find Pterostylis incognita in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Pterostylis incognita in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
Gippsland Plain extinct native