Cooley's Meadow-rue

Thalictrum cooleyi is a rare species of flowering plant in the buttercup family known by the common name Cooley's meadow-rue. It is native to the southeastern United States, where it is present in North Carolina, Georgia, and Florida. It is threatened by habitat destruction and degradation. It is a federally listed endangered species of the United States.

This perennial herb produces long, slender stems up to 2 metres (6.6 ft) long, sometimes growing erect. The leaves are each made up of several narrow leaflets, and some of the leaflets are divided further into lobes. Leaves near the base of the plant are borne on petioles. The inflorescence is a raceme or a panicle containing a few flowers each. The species is dioecious, with male and female flowers occurring on separate plants. The flower lacks petals. It has four or five sepals which are white or yellowish in the male flower and greenish in the female. The male to female ratio is 3:1. Blooming occurs in June and July.