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Glyceria obtusa

Glyceria obtusa (Muhl.) Trin.

Panicularia obtusa (Muhl.) Kuntze

Coastal Mannagrass, Atlantic Mannagrass

KingdomPlantaePlants, but not fungi, lichens, or algae
SubkingdomTracheobiontaVascular plants—plants with a “circulatory system” for delivering water and nutrients
DivisionMagnoliophytaFlowering plants, also known as angiosperms
ClassLiliopsidaMonocots (plants with a single seed leaf); includes the lily family
SubclassCommelinidaeDayflowers and spiderworts, and several others
OrderCyperalesFlowering plants including grasses
FamilyPoaceaeGrasses (but not sedges or rushes)
GenusGlyceriaMannagrass or sweetgrass
Speciesobtusa“Blunt”

About plant names...

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.

References:

Hitchcock, Albert Spear; revised by Chase, Agnes, Manual of the Grasses of the United States, Volume 1, Dover Books, 1971, p. 87

Online References:

Glyceria obtusa at the U.S. Geological Survey's Northern Prairie Wildlife Research Center

Glyceria obtusa on Discover Life

Glyceria obtusa at the Lady Bird Johnson Wildflower Center

Glyceria obtusa on ZipcodeZoo.com

Glyceria obtusa (Coastal Mannagrass, Atlantic Mannagrass)

9/20/2009 · Wild Gardens of Acadia, Acadia National Park, Bar Harbor, ME
≈ 5 × 7" (13 × 18 cm)

Glyceria obtusa (Coastal Mannagrass, Atlantic Mannagrass)

9/20/2009 · Wild Gardens of Acadia, Acadia National Park, Bar Harbor, ME
≈ 15 × 10" (39 × 26 cm)

Glyceria obtusa description by Thomas H. Kent, last updated 5 Oct 2016.

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Glyceria obtusa (Coastal Mannagrass, Atlantic Mannagrass)

9/16/2016 · Sieur de Monts Botanical Gardens, Acadia National Park, Bar Harbor, ME

Glyceria obtusa (Coastal Mannagrass, Atlantic Mannagrass)

9/20/2009 · Wild Gardens of Acadia, Acadia National Park, Bar Harbor, ME
≈ 8 × 10" (20 × 26 cm)

Glyceria obtusa (Coastal Mannagrass, Atlantic Mannagrass)

9/16/2016 · Sieur de Monts Botanical Gardens, Acadia National Park, Bar Harbor, ME

Range:

About this map...