Persicaria hydropiperoides

Alluvial swamps, seepage swamps, tidal swamps, maritime swamps, depression swamps and ponds, floodplain ponds and pools, interdune ponds, wind-tidal oligohaline marshes, impoundment marshes, and ditches; also on rocky, sandy, gravelly, or muddy bars and river shores. Common in the coastal Plain; infrequent to locally common in most of the piedmont and the c. and n. mountains; mostly absent from the sw. piedmont and sw. mountains. Based on limited field observations and herbarium study, var. hydropiperoides is widespread throughout the state range, while var. opelousanum is most frequent in the coastal Plain and inner piedmont.