Scientific name

Ammannia L.

Common names




Could be confused with

Alternanthera, Hygrophila, Ludwigia, Lythrum, Nesaea

Native distribution

tropical and warm regions of world

Species commonly cultivated

Ammannia gracilis Guill. & Perrottet (Africa)

A. latifolia L. (North America, Caribbean)

A. senegalensis Lam. (Africa)

Adventive distribution

Ammannia senegalensis is naturalized in Europe and India.

Weed status

Not commonly known to be weedy. Ammannia senegalensis is recorded as weedy in rice fields. Ammannia auriculata is recorded as a weed of rice in the southwestern United States.

Brief description

Annual. Erect, stem commonly red, rounded in cross-section in submersed form, four-sided in emersed form. Leaves decussate, sessile, elongate (commonly 3-8 cm long), typically red to green. Flowers axillary, solitary or in a cyme, actinomorphic, sessile or stalked.

Natural habitat


Additional comments

Cultivated either submersed and/or emersed. Submersed plants rarely branched. Requires high levels of light and nutrients for optimal growth. Ammannia senegalensis may be differentiated from A. gracilis by the downturned recurved leaves in the submersed form, although identifications may be problematic. Floral characteristics do not support this distinction of two separate species, and A. gracilis may simply represent a variety of A. senegalensis.