Aquatic and Wetland Vascular Plants of the Northern Great Plains
63. Poaceae, the Grass Family
13. Glyceria R. Br. -- Mannagrass2. Glyceria grandis S. Wats. -- American mannagrass
Culms 7-14 dm tall, 4-6 mm thick and rather spongy at the base. Leaves 4-12 mm wide, glabrous; sheaths glabrous, the ligule hyaline, entire or lacerate, 3-7 mm long. Panicle 20-35 cm long, oblong to pyramidal, very open with lax, drooping branches at maturity. Spikelets purplish, ovate to narrowly ovate, 3- to 6(9)-flowered, 4-7 mm long; glumes ovate to ovate-lanceolate, acute, the first 1-2 mm long, the second 2-2.5 mm long; lemmas purplish and often bronzed at the tip, oblong-lanceolate, 2.5-3 mm long, rounded to truncate; anthers 3, 0.7-1.1 mm long. Grain dark brown, ovoid, 1-1.3 mm long. Late Jun--early Sep. In shallow water or mud of marshes, ditches, streams, lakes and ponds; common and often abundant in the n part, less so in the s; (Que. and N.S. to AK, s to VA, TN, LA, NE, NM, AZ and WA).
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