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Hydrilla verticillata

Species category

Weed

Common name

waterthyme

Diagnostic characters

Hydrilla verticillata (L. f.) Royle

Noxious weed seed categories

Federal

Learn more on ITP's Federal Noxious Weed Disseminules tool.

AOSA examination list

Not included

Nomenclature

Family

Hydrocharitaceae

Valid name

Hydrilla verticillata (L. f.) Royle

Hydrilla verticillata . Branches. Photo by Julia Scher, USDA-APHIS-PPQ.
Hydrilla verticillata. Branches. Photo by Julia Scher, USDA-APHIS-PPQ.
Hydrilla verticillata. Stems and leaves. Photo by Julia Scher, USDA-APHIS-PPQ.
Hydrilla verticillata. Stems and leaves. Photo by Julia Scher, USDA-APHIS-PPQ.
Hydrilla verticillata. Stems and leaves. Photo by Julia Scher, USDA-APHIS-PPQ.
Hydrilla verticillata. Stems and leaves. Photo by Julia Scher, USDA-APHIS-PPQ.
Hydrilla verticillata. Reproductive parts: turions (“buds” in some of the leaf axils), dark green, cylindrical, to 1/4 in. round. Photo by Julia Scher, USDA-APHIS-PPQ.
Hydrilla verticillata. Reproductive parts: turions (“buds” in some of the leaf axils), dark green, cylindrical, to 1/4 in. round. Photo by Julia Scher, USDA-APHIS-PPQ.