Flowers: sepals 1-veined, scarious margins broad. Heads of achenes 4-9 mm; outer face of achene narrowly elliptic or rectangular. Flowering spring (May). Flats and marshes, often in sagebrush; 600-1500 m; Alta., B.C., Sask.; Calif., Idaho, Mont., Nev., Oreg., Utah, Wash., Wyo.