American Phragmites Phragmites australis (Cavanilles) Trinius subsp. americanus Saltonstall, P.M. Peterson, & Soreng  

Status:

American Phragmites favors natural wetland systems. It is unlikely to be found in disturbed habitats or mitigation areas.

"Populations of native P. australis occur along the major rivers of the eastern shore of Maryland, particularly the Choptank and Nanticoke Rivers, and were common along river and creek edges and typically less dense than introduced P. australis... The presence of so many populations of native P. australis on the eastern shore of Maryland is unique today as the subspecies has all but disappeared from much of its historical range along the Atlantic Coast" (Meadows & Saltonstall, 2007).

Description:

"Characters used to distinguish the two population types included degree of senescence (introduced plants remained green well into November while native plants had already senesced), culm color (maroon or bright yellow color indicated native), degree to which leaf sheaths were attached to the culms (introduced plants retain their leaf sheaths on the culm while natives tend to drop their leaves and leaf sheaths after senescing), and presence/absence of culm spots (native plants may have black spots near the nodes; Blossey 2002, Saltonstall et al. 2004)" (Meadows & Saltonstall, 2007).

There are 16 records in the project database.

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