Persicaria hydropiperoides (Michaux) Small. Section: Persicaria. Waterpepper. Phen: May-Nov. Hab: Swamp forests, streams, ditches. Dist: NS, ON, and AK, south to FL, TX, and CA, and into the New World tropics.

Origin/Endemic status: Native

Synonymy: = Ar, FNA5, K3, K4, Mex, Mi, NE, NY, Pa, Tn, Va; = Polygonum hydropiperoides Michx. – Bah, K1, NcTx, W, WH3, WV, Horton (1972); > Persicaria hydropiperoides (Michx.) Small – S; > Persicaria hydropiperoides (Michx.) Small var. bushiana (Stanford) Mohlenbr. – Il; > Persicaria hydropiperoides (Michx.) Small – Il, Tx; > Persicaria hydropiperoides (Michx.) Small var. opelousana (Riddell ex Small) J.S.Wilson – Tx; > Persicaria opelousana (Riddell ex Small) Small – Il, S; > Polygonum hydropiperoides Michx. – GW2, Mitchell & Dean (1978); > Polygonum hydropiperoides Michx. var. breviciliatum Fernald – F; > Polygonum hydropiperoides Michx. var. bushianum Stanford – F; > Polygonum hydropiperoides Michx. var. digitatum Fernald – F; > Polygonum hydropiperoides Michx. var. euronotorum Fernald – F; > Polygonum hydropiperoides Michx. var. hydropiperoides – C, F, RAB; > Polygonum hydropiperoides Michx. var. opelousanum (Riddell ex Small) Riddell ex W.Stone – C, RAB; > Polygonum hydropiperoides Michx. var. psilostachyum H.St.John – F; > Polygonum opelousanum Riddell – GW2, Mitchell & Dean (1978); > Polygonum opelousanum Riddell var. adenocalyx Stanford – F; > Polygonum opelousanum Riddell var. opelousanum – F

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