Examples from the Web for anacharis
Water-thyme (Anacharis canadensus) grows in slow-flowing streams.
Anacharis should not be introduced into any water, either pond or stream, unless it can be kept down easily.Amateur Fish Culture|Charles Edward Walker
Among the several varieties of the weeds, I noticed a great quantity of "Anacharis."Three Months of My Life|J. F. Foster
The best for this purpose are valesneria spiralis, anacharis, and chara vulgaris.
Anacharis is in Canada, and should, by rights, be in Vermont.