The original range of this grass is not known, but it is found in eastern North
America, especially in coastal areas.
Identification: Stems are upright but often prostrate at the base,
20-39" (50-100 cm) tall, growing in wet soil or shallow standing water. Grass blades are up to 12" (30 cm) and ¹/₁₆-⅛" (2-6 mm) wide, rough on the upper surface. Flowering tops, or panicles, are 1¾-6" (5-15 cm) long,
and very dense,
a key identifying feature. Each flower contains 4-7 green spikelets ⅛-³/₁₆" (4-6 mm) long.
Coastal mannagrass blooms June through August.