Classification
Class
Magnoliopsida Brongn.
Order
Asparagales Link
Family
Orchidaceae Juss.
Genus
Cyrtostylis R.Br.
 Nomenclature
Scientific Name:
Cyrtostylis rotundifolia Hook.f., Bot. Antarct. Voy. II. (Fl. Nov.-Zel.) Part I, 246 (1853)
Synonymy:
  • ≡ Cyrtostylis oblonga var. rotundifolia (Hook.f.) Cheeseman, Man. New Zealand Fl. 685 (1906)
  • = Cyrtostylis macrophylla Hook.f., Bot. Antarct. Voy. II. (Fl. Nov.-Zel.) Part I, 246 (1853)
 Description

Plant at fl. c. 3–10 cm. tall, elongating later. Stem erect, slender. Green lf sessile, almost basal, c. 1–3–(4) × 0.8–1.7 cm., oblong-ovate, obtuse to subacute, cordate to rounded at base. Raceme to c. 3 cm. long; floral bracts us. membr. and small. Fls 1–4; per. 8–10 mm. long, widespreading, pink to greenish. Sepals subequal; dorsal narrow linear-lanceolate, obtuse, erect, concave; lateral narrow-linear, acute. Petals similar to lateral sepals. Labellum about as long as sepals, oblong; tip obtuse, not recurved; surface almost plane except for a shallow longitudinal groove leading down to each of the 2 basal calli. Column shorter than labellum, clearly displayed; wings narrow below, widening above so that stigma is flanked by 2 lobes. Pollinia tabular, ± crescentic, 2 in each anther cell, breaking easily into single grains.

[From: Moore and Edgar (1970) Flora of New Zealand. Volume 2 as Acianthus reniformis (R.Br.) Schltr.]

 Biostatus
Indigenous (Endemic)
 Bibliography
Cheeseman, T.F. 1906: Manual of the New Zealand Flora. Government Printer, Wellington.
de Lange, P.J.; Rolfe, J.; St George, I.; Sawyer, J. 2007: Wild Orchids of the Lower North Island: Field guide 2007. Department of Conservation, Wellington Conservancy, New Zealand.
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]
Hooker, J.D. 1852–1853 ("1853"): The Botany of the Antarctic Voyage of H.M. Discovery Ships Erebus and Terror in the Years 1839–1843, under the command of Captain Sir James Clark Ross. II. Flora Novae-Zelandiae. Part I. Flowering plants. Lovell Reeve, London.
Kores, P.J. 1995: A systematic study of the genus Acianthus (Orchidaceae: Diurideae). Allertonia 7(3): 87–220.