Not an accepted name (status: unknown). The accepted name is Alternanthera minutiflora (Seub.) Suess., 1934.

Alternanthera multiflora (Seub.) Schinz, 1934 2% complete

No common name

H.G.A.Engler, Nat. Pflanzenfam. ed. 2, 16c: 75 (1934)

There is no corrections for Alternanthera multiflora yet.