Koeleria lasiorhachis

Detailed description

Stout, erect to somewhat lax, narrowly tufted, greyish green, glaucous to dull green grass 50–850 mm tall, sometimes rhizomatous, with pale straw-coloured leaf-sheaths. Branching extravaginal. Leaf-sheath to 60 mm long, pubescent. Collar hairs sparse, pilose, long. Ligule 0.3–0.8 mm, truncate, erose, glabrous or ciliate. Leaf-blade 50–250 × 1.3–3.0 mm, flat, rarely inrolled and narrower, often with scattered long pilose hairs, undersides prickle-toothed toward apex, upper surface ribbed with more or less scattered minute prickle-teeth or short hairs on ribs; margins minutely prickle-toothed, and often bearing scattered long pilose hairs. Culm 100–500 mm, internodes pilose above and below nodes, densely pilose, pubescent or glabrous towards panicle. Panicle 30–210 × 10–50 mm, lanceolate, usually open with visible rachis but spikelets clustered and individually inconspicuous; rachis, branches, and pedicels densely pilose to sparsely, minutely hairy. Spikelets 5–8 mm, pale green or purple-tinged. Glumes unequal, keels often strong, prickle-toothed in upper ½ or almost throughout; lower ⅔–⅘ length of upper, narrow-oblong, tapered to an often long-acuminate apex, upper < spikelet, elliptic, acute to shortly acuminate; margins almost entire with very few prickle-teeth near apex. Lemma 5.0–7.5 mm, bicuspid, minutely prickle-toothed or papillate; awn 5.0–9.5 mm, straight to later recurved, insertion point in upper ½–⅓ of lemma. Palea minutely prickle-toothed on keels and margins. Callus hairs to 0.8 mm. Rachilla hairs to 2 mm. Lodicules c. 1.3 mm, glabrous. Anthers 1.8–22. mm. Ovary to 1 mm long; stigma-styles to 2.4 mm. Seed 2.5 × 0.8 mm.