Alternanthera Forssk.
Engl.: joyweed.

Alternanthera brasiliana

Alternanthera brasiliana (L.) Kuntze.
Engl.: Brazilian joyweed, alligatorweed, Joseph's coat.
Bot. syn.: Achyranthes brasiliana (L.) Standl., Gomphrena brasiliana L.

Alternanthera paronichyoides

Alternanthera paronichyoides A. St.-Hil.
Bot. syn.: Alternanthera polygonoides auct. non (L.) R. Br. ex Sweet,.

Alternanthera philoxeroides

Alternanthera philoxeroides (Mart.) Griseb.
Engl.: alligator weed, green lead plant, pigweed.
Bot. syn.: Achyranthes philoxeroides (Mart.) Standl.

Alternanthera polygonoides

Alternanthera polygonoides (L.) R. Br.
Bot. syn.: Achyrnathes polygonoides (L.) Lam., Gomphrena polygonoides L., Telanthera polygonoides (L.) Moq.

Alternanthera polygonoides auct. non (L.) R. Br. ex Sweet, Amaranthaceae: See Alternanthera paronichyoides St.-Hil.

I have no articles for this botanical term, but there might be some for the next level down (if found).