| Documentation |
State |
Type |
| 1946. Rhodora. |
CT, NJ, NY, WI |
Literature |
| 1949. Indiana Academy of Science. |
IN |
Literature |
| Cooperrider, T.S. 1982. Endangered and threatened plants of Ohio. Ohio Biological Survey Notes No. 16. Ohio State University, Columbus. |
OH |
Literature |
| Deam, C.C. 1940. Flora of Indiana. Wm.B. Burford Printing Co., Indianapolis. |
IN |
Literature |
| Demaree, D. 1943. A catalog of the vascular plants of Arkansas. Taxodium 1: 1-88. |
AR |
Literature |
| Endangered Species Protection Board. 1999. Endangered and threatened species list (20 October 2002). Illinois Department of Natural Resources, Illinois. |
|
Literature |
| Fisher, T.R. 1988. The Dicotyledoneae of Ohio. Part 3. Asteraceae. Ohio State University Press, Columbus. |
OH |
Literature |
| George, G.G. 1992. A synonymized checklist of the plants found growing in Rhode Island. Rhode Island Wild Plant Society. |
RI |
Literature |
| Herkert, J.R. (ed.). 1991. Endangered and threatened species of Illinois: Status and distribution. Vol. 1, Plants. Illinois Endangered Species Protection Board. |
IL |
Literature |
| Illinois Plant Information Network (ILPIN). |
IL |
Literature |
| Pennsylvania Natural Diversity Inventory. |
PA |
Literature |
| Smith, E.B. 1988. An atlas and annotated list of the vascular plants of Arkansas, 2d ed. |
AR |
Literature |
| Strausbaugh, P.D., and E.L. Core. 1977. Flora of West Virginia, 2nd ed., 4 vols. West Virginia Bulletin, Morgantown. |
WV |
Literature |
| Voss, E.G. 1985. Michigan flora. Cranbrook Institute of Science, Bloomfield Hills. |
MI |
Literature |
| West Virginia county level data. |
WV |
Literature |
| Yatskievych, G., and J. Turner. 1990. Catalogue of the flora of Missouri. Monographs in Systematic Botany from the Missouri Botanical Garden 37. Missouri Botanical Garden, St. Louis. |
MO |
Literature |
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