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Image Subject Name Scientific Name Description
0002160 hydrilla Hydrilla verticillata subsoil turions (tubers) at the end of horizontal stolons. These asexual reproductive structures are resistant to herbicides, and allow for rapid recolonization of a treated site
0002159 hydrilla Hydrilla verticillata heavy infestation, the rapid underwater growth "pushes" a portion of the mat above the water, giving the reservoir a field-like appearance
0002161 hydrilla Hydrilla verticillata Joe Balciunas surveying for hydrilla agents (August 1983) at Lake Dal. Of the four agents approved for release two were shipped from India.
0002158 hydrilla Hydrilla verticillata growing tip

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