Vascular Plants of North Carolina
Account for Nuttall's Reedgrass - Greeneochloa coarctata   (A.A. Eaton) P.M. Peterson et al.
Members of Poaceae:
Only member of Greeneochloa in NC.
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Section 5 » Family Poaceae
Author(A.A. Eaton) P.M. Peterson et al.
DistributionMostly Coastal Plain, Sandhills, and Mountains; curiously scarce in the Piedmont, but as it is also scarce in much of the VA Piedmont, this scarcity is real.

N.S. to northeastern SC, mostly on the Coastal Plain; in the Mountains south to GA and AL.
AbundanceFrequent to common in the Coastal Plain and Mountains, except rare to locally uncommon in most of the Piedmont; distribution is clearly bimodal. Individual populations seldom have more than 10-20 plants. The website editors suggest a State Rank of S5 owing to its broad range and being frequently encountered in many areas.
HabitatMoist to wet forests (usually near streams), montane bogs, wet pine savannas.
PhenologyFlowering and fruiting July-October.
IdentificationWhen fresh, the inflorescence is denser than that of Calamagrostis canadensis, C. cainii, and C. porteri. The inflorescence is also pale green with a purplish tinge (vs. pale brown or straw color in the other 3 species). The awns are very short and are attached to the upper 2/5 of the lemmas (vs. attached in the lower 1/2 of the lemmas in the other several species).
Taxonomic CommentsLong known as Calamagrostis cinnoides (Muhlenberg) W.P.C. Barton. In a 2019 paper, Peterson et al. have created the genus Greeneochloa for this and one other species.

Other Common Name(s)Arctic Reedgrass, Small Reedgrass
State RankS4 [S5]
Global RankG5
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US Status
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B.A. SorrieWet spot in floodplain, early Oct 2014. MoorePhoto_natural
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