| Institution namesa | Institution codes |
|---|---|
| Archbold Biological Station | ARCH |
| Arizona State University | ASU |
| Ohio University | BHO |
| Centre County Historical Society | CCHS |
| The College of Idaho | CIC |
| Central Michigan University | CMC |
| University of Connecticut | CONN |
| Converse College | CONV |
| Denver Botanic Gardens | DBG |
| Desert Botanical Garden | DES |
| Eastern Illinois University | EIU |
| The Ronald L. Jones Herbarium | EKY |
| Eastern Michigan University | EMC |
| Florida Museum of Natural History | FLAS |
| Florida State University | FSU |
| University of Georgia | GA |
| Gray Herbarium, Harvard University | GH |
| Georgia Southwestern State University | GSW |
| Hope College | HCHM |
| Portland State University | HPSU |
| University of Idaho | ID |
| Idaho State University | IDS |
| University of Illinois | ILL |
| Illinois Natural History Survey, Illinois Dept. of Natural Resources | ILLS |
| Keene State College | KESC |
| University of Rhode Island | KIRI |
| Louisiana State University | LSU |
| University of Michigan | MICH |
| University of Minnesota | MIN |
| University of Mississippi | MISS |
| Mississippi State University | MISSA |
| Missouri Botanical Garden | MO |
| Morton Arboretum, Illinois | MOR |
| Marshall University | MUHW |
| North Carolina State University | NCSC |
| University of North Carolina at Chapel Hill | NCU |
| Natural History Museum of United Kingdom | NHMUK |
| New York Botanical Garden | NY |
| Marie Selby Botanical Gardens | SEL |
| Boise State University | SRP |
| Troy University | TROY |
| Tall Timbers Research Station | TTRS |
| James F. Matthews Center for Biodiversity Studies | UNCC |
| University of New Mexico | UNM |
| Smithsonian Institution | US |
| University of South Carolina | USCH |
| University of South Carolina Upstate | USCS |
| University of South Florida | USF |
| University of Southern Mississippi | USMS |
| Intermountain Herbarium, Utah State University | USU |
| University of West Florida | UWFP |
| University of Wisconsin–La Crosse | UWL |
| University of Wisconsin–Milwaukee | UWM |
| Valdosta State University | VSC |
| Western Carolina University | WCUH |
| Whitman College | WCW |
| University of Wisconsin–Madison | WIS |
a
All institutions are located in the United States.