Bromus inermis Leyss.

Light green, perennial tufts to 100 cm, with creeping rhizomes. Leaf-sheath glabrous; basal sheaths sometimes reddish purple. Ligule 0.5–2 mm, truncate, ciliate. Leaf-blade 10–16 cm × 4–9 mm, glabrous; margins finely scabrid. Culm erect, internodes glabrous. Panicle 10–20 cm, open or contracted, erect; rachis slightly compressed, scabrid on angles, branches filiform, finely scabrid. Spikelets 15–25 mm, 3–5-flowered, parallel-sided, compressed, brownish green. Glumes unequal, subobtuse, glabrous, keel minutely scabrid near apex; lower 4–4.5 mm, 1-nerved, upper 6–6.5 mm, 3-nerved. Lemma 8–10 mm, 5–7-nerved, rounded, usually glabrous but sometimes finely pubescent at base, apex obtuse, hyaline; awn 0, or rarely 1–2 mm. Palea ≈ lemma. Callus glabrous. Rachilla finely scabrid or with minute hairs. Anthers 4.3–5.5 mm. Caryopsis c. 7.5 × 2 mm. Chasmogamous.

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