Dig deeper at SERNEC, a consortium of southeastern herbaria.
Read more about this tiny fast-growing aquatic plant at http://dnr.wi.gov/topic/Invasives/fact/Mudmat.html
Check out EDDMapS.org to see where this has been reported.
Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Asterids: Lamiids: Lamiales
No pictures are available at this time.