Arizona State University Vascular Plant Herbarium | Botanical Research Institute of Texas, Philecology Herbarium | California Polytechnic State University, Robert F. | Hoover Herbarium | Carnegie Museum of Natural History Herbarium | Duke University | Fairchild Tropical Botanic Garden | Huntington Botanical Gardens Herbarium | Illinois Natural History Survey | Indiana University Herbarium, Deam Herbarium | Intermountain Herbarium (Vascular plants & algae) | Iowa State University, Ada | Hayden Herbarium | Louisiana State University, Shirley C. Tucker Herbarium | Lundell Herbarium at the University of Texas at Austin | Lundell Herbarium at the | University of Texas at Austin | North Carolina State University Vascular Plant Herbarium | Tennessee Technological University Herbarium | University of Arizona | Herbarium | University of California, Riverside Plant Herbarium | University of Colorado Museum of Natural History Herbarium Vascular Plant Collection | University of Florida Herbarium | University of Tennessee Vascular Herbarium | University of Texas at Austin Herbarium | University of Texas at El Paso Biodiversity Collections | Herbarium | University of Vermont, Pringle Herbarium | University of Wisconsin-Madison, Wisconsin State Herbarium | General Research Observations |