Derivation
Deyeuxia Clarion ex P.Beauv., Ess. Agrostogr. 43, t. 9, figs, 9 & 10 (1812); after Nicolas Deyeux (1753–1837). Professor of Pharmacy Medicine, Paris.

carinata- from the Latin carina (keel) and -atus (possessing). Leaf-blades keeled at tip.

Published in
Contr. New South Wales Natl. Herb. 1: 58 (1940).

Common synonyms
Calamagrostis carinata (Vickery) R.Govaerts

Habit
Perennial, tufted. Culms erect or decumbent, 20–55 cm tall, 3-noded. Lateral branches simple. Leaves mostly basal. Leaf-sheaths longer than adjacent culm internode, striately nerved, scaberulous. Ligule a fringed membrane, 5–6 mm long, membranous, erose, truncate. Leaf-blades linear, flat or conduplicate, 5–12(–17) cm long, 1–4 mm wide. Leaf-blade surface scaberulous or scabrous. Leaf-blade apex abruptly acute, callose.

Inflorescence
Inflorescence solid, a panicle. Panicle contracted or spiciform, linear or oblong, dense, 2.5–12 cm long. Primary panicle branches appressed. Panicle branches scabrous.

Spikelets
Spikelets solitary. Pedicels 0.5–2 mm long, scabrous. Fertile spikelets 1-flowered, comprising 1 fertile floret, with a barren rhachilla extension, lanceolate, laterally compressed, 4.5–6 mm long, breaking up at maturity. Spikelets disarticulating below each fertile floret. Floret callus pubescent, hairs 0.2–1.2 mm long.

Glumes
Glumes persistent, similar, firmer than fertile lemma, gaping. Lower glume lanceolate, 90% length of upper glume, membranous, much thinner on margins, 1-keeled, 1-nerved, midnerve scaberulous. Lower glume lateral nerves absent. Lower glume surface asperulous. Lower glume apex acute or acuminate, mucronate. Upper glume lanceolate, equalling adjacent fertile lemma, membranous, with hyaline margins, 1-keeled, 1-nerved, midnerve scaberulous. Upper glume lateral nerves absent. Upper glume surface asperulous. Upper glume apex acute or acuminate.

Florets
Fertile lemma lanceolate or ovate, 3.5–5.5 mm long, membranous or indurate, 5-nerved. Lemma lateral nerves obscure or prominent. Lemma surface scaberulous. Lemma apex dentate, 2-fid, truncate, 1-awned. Median (principal) awn dorsal, arising 60% way up back of lemma, geniculate, 4 mm long overall, with a straight or slightly twisted column or with a twisted column. Palea 3.5 mm long, membranous. Palea keels scaberulous, adorned above. Palea apex truncate. Rhachilla extension 0.5–1 mm long, glabrous. Lodicules 2. Anthers 3, 0.7 mm long, retained within floret. Stigmas 2. Grain with adherent pericarp. Hilum punctiform. Disseminule comprising a floret.

Continental Distribution:
Australasia.

Australian Distribution:
New South Wales, Victoria, Tasmania.

New South Wales: Northern Tablelands, Southern Tablelands. Victoria: Eastern Highlands, Snowfields. Tasmania: West Coast, Central Highlands, Ben Lomond, Mt Field, Mt Wellington.

Classification. (GPWG 2001):
Pooideae: Aveneae

Notes
Endemic. S from the Walcha district, N.S.W., A.C.T., Vic. and Tas. In damp, rocky areas and swamps in montane areas. Flowers Dec.–Mar.