American Indian Ethnobotany in the Prairie Bioregion of South Dakota, North Dakota and Nebraska. Karen Walker is the Native American Ethnobotany Program Manager at the William L. Brown Center and works on a program developed in collaboration with the Lakota and Dakota Sioux People of South and North Dakota to explore the Traditional Ecological Knowledge (TEK) of that region. The Lakota and Dakota People have accumulated knowledge as well as skills in using plants that grow aroun...

1.) Morphology and Systematics of the Genus Ptelea. Ptelea is a genus of trees belonging to the citrus family; it is native to the eastern and southern portions of North America, where it has been used in traditional herbal medicine. The last revision of this genus, in 1962, recognized three species. Two of these were local southwestern species; P. trifoliata was broadly defined as a widespread and variable species, with five subspecies most of which w...