WATER-THYME (Elodea canadensis), a small submerged water-weed, native of North America; it is also known as Ameri can water-weed. It was introduced into co. Down, Ireland, about 1836, and appeared in England in 1841, spreading through the country in ponds, ditches and streams, which were often choked with its rank growth. Elodea belongs to the family Hydrochari
taceae, which includes also the frog-bit (Hydrocharis Morsus ranae), the water-soldier (Stratiotes aloides) and the eel-grass (Vallisneria spiralis).