Pterostylis irsoniana
(named for Bruce Irwin and Owen Gibson,
who first found it on Mount Egmont)

Labellum gradually narrowed to a slightly
swollen, truncate or variously crenulate tip.
Labellum unique in having a large, dark,
prominent callus at the base, and sometimes
incipient calli along the midline

Distribution: endemic - North Id
From Mount Egmont / East Cape southwards -
not so far recorded from Mount Ruapehu.
South Id Nelson / Westland

Flowers: December-February - insect pollinated

Pterostylis montana
(growing on mountains)

Flower squat, box-like, sepals short, the lateral
broadly acuminate, barely exceeding the galea.
Labellum tip unevenly constricted.
Stigma shortly ovate

Distribution: endemic - North Id
Taupo - Ruapehu - Egmont southwards.
South Id mountain areas throughout.
Stewart Id Chatham Is

Flowers: December-February - self pollinated

Pterostylis oliveri
(Professor D. Oliver of Kew)

Leaves in a semirosette, or scattered up the stem.
Dorsal sepal strongly incurved.
Lateral sepals with long, ± erect caudae

Distribution: endemic - South Id
Nelson - Arthur's Pass

Flowers: November-January - insect pollinated

Pterostylis patens
(in the context, gaping, the floral segments)

The montane / subalpine form of banksii.
The most obvious characters are the strongly
recurved caudae of the sepals

Distribution: endemic - North Id montane and subalpine areas from the Rangitoto Range (Te Kuiti) southwards

Flowers: December-January - insect pollinated