Thalictrum flavum, known by the common names common meadow-rue,[1][3] poor man's rhubarb,[4] and yellow meadow-rue,[5] is a flowering plant species in the family Ranunculaceae. It is a native to Caucasus and Russia (Siberia). Growing to 100 cm (39 in) tall by 45 cm (18 in) broad, it is an herbaceous perennial producing clusters of fluffy yellow fragrant flowers in summer.