How to tell the native Phragmites from the Invasive Introduced Form

Over at the Blog "Through Handlens and Binoculars"  Scott Namestnik has a good post about how to separate the native form of Common Reed Phragmites australis ssp americanus from the invasive European P. a. ssp australis. There is also a link to an excellent  power point presentation of  "A Phragmites Field Guide: Distinguishing Native and Exotic Forms of Common Reed (Phragmites australis) in the United States".  by Jil Swearingen and Kristin Saltonstall.
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updated Sept. 28th to fix the links.

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