15 cm ruler for scale

Erect perennial with spikes of small yellow flowers from leaf axils mid-stem, spikes to 2 cm long, flowers to 5 mm in diameter. Leaves are linear-lanceolate, opposite, stalkless. Leaf featured in above photo was 9.5 cm long and 2 cm wide. Stems and pedicels are hairy and we observed small hairs on central nerve on bottom of leaf, top of leaf is glabrous.

Habitat is marshes and other wet places in the Parkland and Boreal forest. Fairly common.

Budd's Flora lists height to 100 cm, we measured plants to 52 cm tall.

The above photos were taken July 8th, edge of wet black spruce woods, Boreal Forest, about 350 km north east of our home in Regina, SK.