This plant grows in wet habitat types, often alongside Polygonum and Cyperus species.
Further towards the centre of the villus where the flooding is lengthier and truly hydrophytic species such as Alternanthera sessilis, Polygonum spp.
An amateur botanist, Annie Bidwell collected the first known specimen of a small annual plant which was then named Bidwell's knotweed (Polygonum bidwelliae), after her.
It is also known as Polygonum multiflorum, and is predominantly referred to as such in PubMed.
Persicaria perfoliata (esp. NJ to Mass), a.k.a. Polygonum perfoliatum, mile-a-minute weed, Asiatic tearthumb, devil's tearthumb, or devil's tail
Methyl caffeate, ethyl caffeate and other phenolic compounds can be found in Polygonum amplexicaule var. sinense (Chinese name: Xuesanqi), a widely distributed medicinal plant in China.