Scientific Name:
Lachnagrostis filiformis (G.Forst.) Trin., Fund. Agrost. (Trinius) 128, t. 10 (1820)
  • Avena filiformis G.Forst., Fl. Ins. Austr. 9 (1786)
  • Agrostis filiformis (G.Forst.)Spreng (1807)
  • Calamagrostis filiformis (G.Forst.) Cockayne, Rep. Bot. Survey Tongariro Natl. Park 35 (1908)
  • Deyeuxia filiformis (G.Forst.) Petrie, Subantarctic Is. N. Z., 474 (1909)
  • = Agrostis avenacea J.F.Gmel. (1791)
  • Lachnagrostis avenacea (J.F.Gmel.) Veldkamp, Blumea 37: 230 (1992)
  • = Agrostis forsteri Roem. & Schult., Syst. Veg. 359 (1817)
  • Lachnagrostis forsteri (Roem. & Schult.) Trin. (1824) nom. nov.
  • Deyeuxia forsteri (Roem. & Schult.) Kunth (1829)
  • = Agrostis solandri F.Muell., Veg. Chatham Isl. 60 (1864)
Vernacular Name(s):
New Zealand wind grass; Perehia; Pūrei; Repehina; Toherāoa; Tumble grass; Turikōka; Wind grass

Open, bluish green or light green, annual or short-lived perennial tufts, (12)–20–70 cm, whole plant often withering early and culms not breaking up below panicle; branching intravaginal. Leaf-sheath firmly membranous, distinctly ribbed, glabrous below, very finely scabrid above, light green, later light brown. Ligule (1)–2–5 mm, oblong, rounded or tapered, later lacerate, abaxially with sparse prickle-teeth. Leaf-blade 2.5–8–(18) cm × 1.5–3 mm, usually flat, sometimes involute and 0.5–1 mm diam., glabrous, or ribs scabrid; margins very finely scabrid, tip fine, acute. Culm 10–35 cm, erect to spreading, internodes usually densely, minutely scabrid, occasionally smooth. Panicle 9–30 × (0.5)–2–25 cm, delicate, enclosed at base by the uppermost leaf-sheath, at first contracted, later very lax; branches filiform, numerous, unequal, very finely scabrid, primary branches naked for much of their length, with spikelets in clusters of 2-several, towards tips of the much shorter capillary secondary branchlets. Spikelets 2.5–3.5–(4.2) mm, pale silvery green to purplish. Glumes subequal, acute to acuminate, usually glabrous, membranous, very narrow linear-lanceolate, lower glume usually slightly longer and more acuminate; keel scabrid almost to base. Lemma 1.3–2–(2.3) mm, ½-⅔ length of glumes, 5-nerved, moderately covered with very short hairs, oblong-ovate, glabrous near hyaline, truncate, erose apex, lateral nerves very shortly excurrent; awn 3–6 mm, geniculate, ± middorsal or from c. upper ⅓. Palea ¾-⅘ length of lemma, keels c. 0.1 mm apart, apex subobtuse. Callus ringed by minute hairs 0.3–0.4 mm, to ¼ length of lemma. Rachilla prolongation 0, or to c. 0.3 mm tipped with hairs to c. 0.8 mm. Lodicules 0.5–0.9 mm, linear, acute. Anthers 0.2–0.5 mm. Caryopsis 0.8–1.3 × 0.3–0.5 mm.

[From: Edgar and Connor (2000) Flora of New Zealand. Volume 5 (second printing).]

Indigenous (Non-endemic)
1817: Systema Vegetabilium. Vol. 2.
Cockayne, L. 1908: Report on a Botanical Survey of the Tongariro National Park. Government Printer, Wellington.
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]
Edgar, E. 1995: New Zealand species of Deyeuxia P.Beauv. and Lachnagrostis Trin. (Graminieae: Aveneae)*. New Zealand Journal of Botany 33: 1–33.
Forster, J.G.A. 1786: Florulae Insularum Australium Prodromus. Dietrich, Göttingen.
Mueller, F.J.H. 1864: The vegetation of the Chatham Islands. Government Printer, Melbourne.
Petrie, D. 1909: The Gramina of the Subantarctic Islands of New Zealand. In: Chilton, C. (ed.) The subantarctic islands of New Zealand : reports on the geo-physics, geology, zoology, and botany of the islands lying to the south of New Zealand, based mainly on observations and collections made during an expedition in the government steamer "Hinemoa" (Captain J. Bollons) in November, 1907. Vol. 2. Philosophical Institute of Canterbury, Government Printer, Christchurch. 472–481.
Trinius, C.B. 1820: Fundamenta Agrostographiae. J.G. Heubner, Vienna.
Veldkamp, J.F. 1992: Miscellaneous notes on Southeast Asian Gramineae VII. Blumea 37: 227–237.