Phalaris angusta Nees ex Trin.

Annual, caespitose. Culms 15–100 (–150) cm high, 4–7-noded. Young shoots intravaginal. Leaves: basal sheaths often basally purple; ligule entire or irregularly toothed or erose; blade 4–33 cm long, (2–) 3–11 mm wide. Panicles spike-like, 2–18.5 cm long, narrowly cylindrical to elongated, sometimes interrupted. Spikelets all bisexual. Glumes subequal, usually 2.8–4.5 mm long, 3-nerved; nerves prominent, green, scaberulous; intercostal regions papillose to scaberulous; keel-wing conspicuous, narrow, on upper 2/3 of keel, wider near apex (where it may be shortly and abruptly acute), tapering more gradually towards base than apex. Sterile lemmas 2, subequal, c. 0.8–1.5 mm long. Bisexual floret brown at maturity; lemma 2–3.4 mm long, acute to acuminate, becoming indurated, silky; palea with similar hairs to lemma on keel; anthers (0.7–) 1–1.2 mm long; styles basally fused.

Grows in wet sites and areas susceptible to seasonal inundation. 

J.W. Vickery (Fl. New South Wales 19(2): 288, 1975) notes that this species reportedly provides excellent winter feed when other grasses are growing only slowly and that it appears to be distributed by flooding on low-lying ground.