Class
Order
Family
Genus
Classification
Nomenclature
Scientific Name:
Pterostylis irsoniana Hatch (1950)
Description
Plant to c. 35 cm. tall at fl., us. less. Stem us. erect, smooth, internodes < lvs. Lvs mostly 3–5, the size changing from below upwards, the largest lf on a stem c. 4–15–(18) cm. × 5–12 mm.; all linear-lanceolate, ± keeled, acuminate, widest near sheathing base, us. overtopping fl. Fl. solitary, ovary us. erect. Dorsal sepal (1.5)–2.5–3 cm. tall, the erect part us. long and the ± horizontal part proportionately rather short, acuminate to shortly caudate; lateral sepals diverging at a narrow angle, tips acuminate to shortly caudate, not greatly exceeding galea. Petals little shorter than dorsal sepal, tips narrow-acuminate. Labellum narrow-triangular and protruding, gently arched but us. curled sharply downwards at the narrow, cucullate, obtuse tip; midrib evanescent distally, proximally prominent and ± papillose, terminating basally in a projecting dark callus. Column almost as tall as labellum; stigma long, narrow.
[From: Moore and Edgar (1970) Flora of New Zealand. Volume 2.]
Biostatus
Indigenous (Endemic)
Phenology
Flowering: (Nov.)–Dec.–Jan.
Bibliography
de Lange, P.J.; Rolfe, J.R.; Barkla J.W.; Courtney, S.P.; Champion, P.D.; Perrie, L.R.; Beadel, S.N.; Ford, K.A.; Breitwieser, I.; Schönberger, I.; Hindmarsh-Walls, R.; Heenan, P.B.; Ladley, K. 2018: Conservation status of New Zealand indigenous vascular plants, 2017. New Zealand Threat Classification Series. No. 22. [Not Threatened]
de Lange, P.J.; Rolfe, J.R.; Champion, P.D.; Courtney, S.P.; Heenan, P.B.; Barkla, J.W.; Cameron, E.K.; Norton, D.A.; Hitchmough, R.A. 2013: Conservation status of New Zealand indigenous vascular plants, 2012. New Zealand Threat Classification Series 3. Department of Conservation, Wellington. [Not Threatened]
Jones, D.L.; Clements, M.A.; Molloy, B.P.J 2002: A Synopsis of the Subtribe Pterostylidinae. Australian Orchid Research 4: 129–146.
