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Pterostylis alpina R.S.Rogers
Family Orchidaceae
Pterostylis alpina R.S.Rogers APNI*

Description: Terrestrial herb.

Rosette leaves 3–5, scattered on the basal part of the stem, ovate to elliptic or obovate, 2–6 cm long, 10–15 mm wide, margins entire; sessile.

Scape to 30 cm high; stem scabrous. Flower c. 3 cm long, erect, dark green and white. Apex of galea flat or slightly decurved. Dorsal sepal acute to subacute. Lateral sepals loosely embracing the galea leaving a lateral gap; sinus broadly notched when viewed from the front, protruding prominently in an abrupt curve when viewed from the side; free points linear-tapered, c. 20 mm long, reflexed behind the galea. Petals broad, subacute. Labellum narrow-ovate to lanceolate, 13–18 mm long, c. 3 mm wide, brown, curved forwards above the middle, subacute, distal third protruding from the sinus in the set position.

Flowering: August–October

Distribution and occurrence: Grows on moist slopes and near streams in high rainfall forest; apparently restricted to the Batlow region in N.S.W.
NSW subdivisions: ST
Other Australian states: Vic. ?Tas.
Threatened species: NSW BCA: Vulnerable
AVH map***

Text by D. L. Jones
Taxon concept: Flora of NSW 4 (1993)

APNI* Provides a link to the Australian Plant Name Index (hosted by the Australian National Botanic Gardens) for comprehensive bibliographic data
***The AVH map option provides a detailed interactive Australia wide distribution map drawn from collections held by all major Australian herbaria participating in the Australian Virtual Herbarium project.
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