Check out EDDMapS.org to see where this has been reported.
Spermatophytes (seed plants): Angiosperms (flowering plants): Monocots: Alismatales
WEAKLEY'S FLORA (11/30/12):
Hydrilla verticillata
FAMILY
Hydrocharitaceae
SYNONYMOUS WITH
PLANTS NATIONAL DATABASE:
Hydrilla verticillata
FAMILY
Hydrocharitaceae
COMMON NAME:
Hydrilla
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Keith Bradley kab_h_verticillata_74746
June Miami-Dade County FL
South Dade Wetlands
Stems and leaves near the surface look like bottle brushes, per Invasive Plants, Guide to Identification, Impacts and Control.
COMPARE
aquatic plants
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JK Marlow jkm160914_166
September
SE-EPPC Aquatic Plant ID Workshop
Fresh leaves noticeably rough to the touch, per Weakley's Flora.
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JK Marlow jkm160914_166b
September
SE-EPPC Aquatic Plant ID Workshop
Leaves mostly 1-2cm long, with stout sharp teeth on margins and midrib beneath, per Weakley's Flora.