Scientific Name:
Pentapogon quadrisetus (Labill.) P.M. Peterson, Romasch. & Soreng in Peterson et al., J. Syst. Evol. 60: 18 (2022)
  • Avena quadriseta Labill., Nov. Holl. Pl. 1, 25, t.32 (1810)
  • Agrostis quadriseta (Labill.) R.Br., Prodr. Fl. Nov. Holland. 171 (1810)
  • Calamagrostis quadriseta (Labill.) Spreng., Syst. Veg., ed. 16 [Sprengel] 1, 253 (1824)
  • Deyeuxia quadriseta (Labill.) Benth., Linnaea 581 (1878)

Variable, rather slender to robust, dense or lax tufts, 15–125 cm, with culms erect or curved upwards from base, much overtopping leaves; branching extravaginal. Leaf-sheath subcoriaceous, greenish brown, keeled above, distinctly ribbed, smooth or finely scabrid, or ribs rarely short-ciliate. Ligule 1.5–3.5–(6) mm, oblong, truncate, erose or finely ciliate, abaxially glabrous. Leaf-blade 2.5–15–(20) cm × 0.5–3.5–(6) mm, flat or inrolled, abaxially smooth or ribs finely scabrid, adaxially strongly ribbed, margins finely scabrid, tip long-tapered, acute to acuminate, finely scabrid. Culm (10)–15–105 cm, internodes smooth or faintly scabrid. Panicle 3–25–(35) × 0.4–2 cm, narrow-linear, cylindric, or up to 3.5 cm wide and lobed below; rachis smooth to scaberulous, branches finely scabrid, usually ± appressed to rachis or slightly spreading in larger panicles, densely covered with spikelets almost to base, pedicels scabrid. Spikelets (3)–3.5–4–(5) mm, greenish to purplish. Glumes 1-nerved, hyaline, elliptic-lanceolate, acute or acuminate, smooth or sometimes scabrid, midnerve scabrid, margins scaberulous. Lemma 2–3.5–(4) mm, c. ¾ length of glumes, submembranous to firm, smooth and shining below, and finely scabrid near apex, or lightly scabrid to distinctly scabrid-papillose throughout, narrow-lanceolate, apex denticulate with lateral nerves excurrent as 4 minute awns; central awn 1.6–6 mm, geniculate, usually arising from lower ⅓ of lemma, often subbasal, occasionally almost middorsal, ± enclosed within or projecting beyond glumes. Palea ˜ lemma, hyaline, keels faintly scabrid in upper ½. Callus hairs wispy, 0.4–1 mm, c. ⅓ length of lemma. Rachilla prolongation 0, or 0.05–0.3 mm, including hairs if any. Lodicules c. 0.3 mm, linear, obtuse. Anthers 0.3–1.3–(1.8) mm. Caryopsis 1.5–2 × 0.4–0.7 mm.

[From: Edgar and Connor (2000) Flora of New Zealand. Volume 5 (second printing). as Deyeuxia quadriseta (Labill.) Benth.]

Indigenous (Non-endemic)
Brown, R. 1810: Prodromus Florae Novae Hollandiae et Insulae Van-Diemen. Johnson, London.
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. [as Deyeuxia quadriseta (Labill.) Benth.] [Declining]
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. [as Deyeuxia quadriseta (Labill.) Benth.] [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. [as Agrostis quadriseta (Labill.) R.Br.; Avena quadriseta Labill.; Calamagrostis quadriseta (Labill.) Spreng.; Deyeuxia quadriseta (Labill.) Benth.]
Labillardière, J.J.H. de 1804: Novae Hollandiae Plantarum Specimen. Vol. 1(1). Huzard, Paris.
Peterson, P.M.; Soreng, R.J.; Romaschenko, K.; Barberá, P.; Quintanar, A.; Aedo, C.; Saarela, J.M. 2022: Phylogeny and biogeography of Calamagrostis (Poaceae: Pooideae: Poeae: Agrostidinae), description of a new genus, Condilorachia (Calothecinae), and expansion of Greeneochloa and Pentapogon (Echinopogoninae). Journal of Systematics and Evolution 60(3): 570–590. (Published online: May 2022)
Sprengel, C.P.J. 1824: Systema vegetabilium [Caroli Linnaei ... ]. Editio decima sexta. Vol. 1. Göttingen.