15 cm ruler for scale

Annual with a branching growth habit. Showy flower heads measured to 3 cm diameter, having brown disk florets, yellow ray florets are 3-lobed, and have reddish-brown bases. Leaves are opposite, once or twice divided into narrow lobes. Leaf highlighted in photo above was 11 cm long and 6.5 cm wide. leaves have short stalks. Lower stem and leaves sparsely hairy, upper stem and leaves glabrous.

Habitat is slough margins, clay flats irrigation ditches on the prairie.

Listed as uncommon in Checklist of the Vascular Plants of Saskatchewan. We've only seen this plant in 2 locations in the Cypress Hills.

Height is listed to 70 cm in Budd's Flora, we measured plants to 60 cm tall.

The above photos were taken July 25th dried up creek bed, Cypress Hills, and August 10th edge of creek Cypress Hills, about 450 km southwest of our home in Regina, SK.