The Administrator has determined that it is necessary to designate the following plants 1 as noxious weeds to prevent their introduction into the United States or their dissemination within the United States:
1 One or more of the common names of weeds are given in parentheses after most scientific names to help identify the weeds represented by such scientific names; however, a scientific name is intended to include all subordinate taxa within the taxon. For example, taxa listed at the genus level include all species, subspecies, varieties, and forms within the genus; taxa listed at the species level include all subspecies, varieties, and forms within the species.
(a)Aquatic and wetland weeds:
Azolla pinnata R. Brown (mosquito fern, water velvet)
Caulerpa taxifolia (Vahl) C. Agardh, Mediterranean strain (killer algae)