rough mannagrass
Glyceria maxima (Hartman) Holmb.


Overview


Reed mannagrass is a perennial, semi-aquatic, rhizomatous grass. Stems are unbranched and can reach 2-8.2 ft. (0.6-2.5 m) in height. Leaves are 12-23.6 in. (30-60 cm) long, 0.2-0.8 in. (6-20 mm) wide, with an acute apex and a prominent midrib. Flowering occurs in June-August, when flowers appear in 6-12 in. (15-30 cm) long panicles. This plant reproduces primarily vegetatively and occurs in sunny to semi-shady wetlands, where it can form dense impenetrable stands. Reed mannagrass is native to northern Eurasia and was first found in North America in 1940 on the edge of Lake Ontario.

Resources


Selected Images



Maps



EDDMapS Distribution

EDDMapS Distribution - This map is incomplete and is based only on current site and county level reports made by experts, herbaria, and literature. For more information, visit www.eddmaps.org

State Regulated List

State Regulated List - This map identifies those states that list this species on their regulated list. For more information, visit Invasive.org

Taxonomic Rank


Kingdom: Plantae
Phylum: Magnoliophyta
Class: Liliopsida
Subclass: Commelinidae
Order: Cyperales
Family: Poaceae
Genus: Glyceria
Subject: Glyceria maxima (Hartman) Holmb.

Categories


Plants - Grass or Grasslike