Alternanthera

It is a widespread genus with most species occurring in the tropical Americas,[2][3] and others in Asia, Africa, and Australia.

The inflorescence is a spike or a rounded head occurring in the leaf axils or the ends of branches.

[1] As of April 2024, Plants of the World Online accepts the following species:[1] Many species have been reported as noxious weeds, including A. angustifolia, A. caracasana, A. denticulata, A. nana, A. nodiflora, A. paronychioides, A. philoxeroides, A. sessilis, A. tenella, and A.

[5] The most important species is alligator weed (A. philoxeroides), a South American aquatic plant that has spread to other continents.

[5] It is a weed of many kinds of agricultural crops, it is an invasive species that degrades native habitat, and its dense mats of vegetation clog waterways, slowing shipping and increasing flooding.

Alternanthera 'Party Time'