Pentapogon quadrisetus (Labill.) P.M. Peterson, Romasch. & Soreng

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.]