Classification
Class
Magnoliopsida Brongn.
Order
Asparagales Link
Family
Orchidaceae Juss.
Genus
Pterostylis R.Br.
 Nomenclature
Scientific Name:
Pterostylis alobula (Hatch) L.B.Moore, New Zealand Journal of Botany 486, f.3 (1969)
Synonymy:
  • ≡ Pterostylis trullifolia var. alobula Hatch, Trans. & Proc. Roy. Soc. New Zealand 77: 244 pl. 30 (1949)
  • ≡ Diplodium alobulum (Hatch) D.L.Jones, Molloy & M.A.Clem. in Jones & Clements, 4: 70 (2002)
 Description

Plant to c. 15 cm. tall, often less. Stem slender, smooth, sts reddish, internodes rarely > lvs. Petiolate lvs in separate rosettes or ± spaced on lower part of fl.-stem; lamina c. 5–15 mm. long, orbicular-cordate to broad-ovate to trulliform, surface not rugose; petiole well-defined in rosette, gradually merging into lamina in lower stem-lvs. Cauline lvs, upper or all, sessile; lamina c. 5–25 × 3–6 mm., linear- to narrow-lanceolate to narrow-elliptic, uppermost us. slightly overtopping ovary. Fl. us. solitary, erect. Dorsal sepal c. 1.5–2.5 cm. tall, tip acuminate, us. ± horizontal; lateral sepals diverging to form V shape from front view, this region in side view smoothly rounded, tips long-caudate and much overtopping galea. Petals almost as long as dorsal sepal, exposed marginal strip of medium width, often nearly horizontal. Labellum arched and protruding, narrowing gradually from base to about mid-length then contracting in width more abruptly and margins recurving so that distal third is linear in outline and deeply channelled beneath, narrow apex truncate. Column shorter than labellum; stigma elliptic, slightly prominent.

[From: Moore and Edgar (1970) Flora of New Zealand. Volume 2 as Pterostylis alobula (Hatch) L.B.Moore]

 Biostatus
Indigenous (Endemic)
 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]
Hatch, E.D. 1949: The New Zealand forms of Pterostylis R.Br. Transactions and Proceedings of the Royal Society of New Zealand 77(2): 234–246.
Janes, J.K.; Duretto, M.F. 2010: A new classification for subtribe Pterostylidinae (Orchidaceae), reaffirming Pterostylis in the broad sense. Australian Systematic Botany 23: 260–269.
Jones, D.L.; Clements, M.A. 2002: A New Classification of Pterostylis R.Br. (Orchidaceae). Australian Orchid Research 4: 64–124.
Jones, D.L.; Clements, M.A.; Molloy, B.P.J 2002: A Synopsis of the Subtribe Pterostylidinae. Australian Orchid Research 4: 129–146.
Moore, L.B. 1968: Taxonomic notes on New Zealand Monocotyledons. New Zealand Journal of Botany 6: 473–492.
New Zealand Journal of Botany