Stems 1-3 dm long, simple or branched above, pubescent only at the nodes,
smooth or scaberulous on the angles. Leaves in whorls of 4, soon recurved
or deflexed, linear-oblanceolate, 8-15 mm long, 1-3 mm wide, hispidulous on
the margins, smooth on the midvein or mostly so, blunt-tipped, tapered to the
base. Inflorescences few, mostly terminal, 3-flowered, soon overtopped
by ascending lateral branches. Corolla lobes 4, 1-1.5 mm long, acute.
Fruit segments black, 1-1.5 mm in diameter; fruiting pedicels
1-2.5(4) mm long. Jun--Jul. Bogs, fens and swamps; rare, nc and se ND and e
SD; (Newf. and Labr. to Alta., s to PA, OH, IL, MN and e SD).