77; see text Hygrophila, commonly known as swampweeds,[2][3] is a genus of flowering plants in the acanthus family, Acanthaceae.

[7] A number of Hygrophila species and cultivars are popular within the aquascaping and aquarium hobbies, including H. angustifolia, H. corymbosa, H. lancea 'Araguaia',[8] H. pinnatifida, H. difformis 'Water Wisteria', H. odora, H. polysperma 'Indian swampweed' and H. siamensis.

Additionally, there are some striking newer forms on the market, such as the vivid hybrids of Hygrophila polysperma, 'Sunset'[9] and 'Rosanervig'.

[10] Many members of the genus are troublesome weeds if they become established within irrigation systems, drains or drainage ditches, as well as in rice fields.

Several have become established outside of their native ranges, either due to accidentally-discarded cuttings or deliberate release, such as H. polysperma in the southern United States.