T HE Rosebud Indian reservation is situated in South Dakota, south of Big White river, and extends from about the middle south line of the state east to the Rosebud lands opened for settlement in 1904. It is bounded on the north by Big White river, on the east by Gregory county (the land opened up for settlement), on the south by Nebraska, and on the west by the Pine Ridge Indian reservation. The soil is sandy Loup Fork Tertiary, Miocene clays or Cretaceous black shales as one proceeds northeast across the reservation from its southwest corner. In the eastern part of this area and in the valley regions the Minnesota and east Nebraska flora prevails; in the medium elevated regions, that of the high plains; and on the high points and in the western part of the reservation, that of the Rocky Mountains. Many Canadian species are also met with. The country in early spring to the middle of the summer is a rose-flower region; hence the name, Rosebud. The Leguminos&e are also prominent flowers, but, though more numerous in species than the Rosacepe, are less conspicuous. In the summer the Leguminosve and the Evening Primrose family vie with each other. The predominating flowers of the fall season are those of the Compositae. The grass family is represented by numerous species, which are themselves very variable. The trees are usually low and spreading, and are usually found only along the streams. The following list of identified plants are the result of the author's observations during the spring, summer and fall of 1904. The work was carried on as time would permit, and, consequently, contains only a small part of the plants of the region. The books used in identifying the plants were Wood's Eastern Botany, Bessey's Botany for High Schools and Colleges, Gray's Lessons and Manual of Botany, and Coulter's Manual of Rocky Mountain Botany. The date in parentheses is that on which the first bloom of that respective plant appeared. Ranunculaceae: Anemone carolinana Walt. Numerous.