Poa infirma Kunth

Loosely tufted, yellow-green, very short-lived, free-seeding annual, to 25 cm; branching intravaginal; leaf-blades persistent. Leaf-sheath very pale green to light brown, hyaline, glabrous, keeled. Ligule 0.5–3 mm, entire, rounded or tapering, glabrous throughout. Leaf-blade 1–5 cm × 1.5–4 mm, flat or folded, thin, glabrous; margins sparsely and minutely scabrid, tip rounded to blunt point. Culm 0.5–20 cm, erect, spreading or prostrate, internodes glabrous. Panicle 0.5–6 cm, lax, erect, with very fine, glabrous branches spreading after anthesis. Spikelets 3–5 mm, with 2–5 rather distant florets, light green. Glumes subequal to unequal, glabrous; lower 1–2 mm, 1-nerved, elliptic, subobtuse, upper 1.5–2.5 mm, 3-nerved, ovate-oblong, obtuse. Lemma 2–2.5 mm, 5-nerved, ovate-oblong, obtuse, strongly silky haired on nerves for more than ½ length, nerves glabrous above hairs, internerves glabrous, often purplish on hyaline band at tip; margins hyaline. Palea 2–2.5 mm, = lemma, keels strongly ciliate, often purplish, interkeel glabrous. Callus glabrous. Rachilla c. 0.5 mm, glabrous; prolongation minute. Lodicules c. 0.2 mm. Anthers (0.1)–0.2–0.4 mm. Caryopsis c. 1 × 0.5 mm, tightly enclosed by lemma and palea.

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