Native Plant Societies
Cincinnati Wild Flower Preservation Society - founded 1917, also known as the Southwest Chapter of the Ohio Native Plant Association
Ohio Prairie Association - contains list of Ohio prairie plants, map of prairie locations
Native Plant Society of Northeastern Ohio - contains some nice images of Ohio plants
Botanizers Club - Wilderness Center (near Wilmot, OH)
Federal and State Agencies
Ohio Department of Natural Resources - links to Ohio parks, vegetative history of the state
Ohio Natural Heritage Database (Division of Natural Areas and Preserves) - contains more than 13,000 records representing known locations for Ohio's rare plants and animals.
The Nature Conservancy - Ohio - includes information on TNC preserves in the state
Herbaria and Collections
The Ohio State University Herbarium (OS) - includes list of type specimens
Miami University - Willard Sherman Turrell Herbarium (MU) - includes constantly updated list of type specimens
Ohio University - Bartley Herbarium (Bryophyte Home Page) - features a searchable bryophyte database
Kent State University Herbarium (KE)
Cincinnati Zoo and Botanical Garden - home of the Local Flora Project, based on a database of herbarium specimens collected from surrounding universities (University of Cincinnati, University of Northern Kentucky, etc.).
Braun, E.L. 1989. The Woody Plants of Ohio. 2nd edition. Ohio State University Press, Columbus, OH. 362 pp.
Braun, E.L. 1967. The Monocotyledoneae: Cat-Tails to Orchids (The Vascular Flora of Ohio, Vol 1.). Ohio State University Press, Columbus, OH. 464 pp.
Cooperrider, T.S. 1995. The Dicotyledoneae of Ohio: Part 2, Linaceae through Campanulaceae. Ohio State University Press, Columbus, OH. 656 pp.
Cooperrider, T.S., A.W. Cusick, & J.T. Kartesz. 2001. Seventh Catalog of the Vascular Plants of Ohio. Ohio State University Press, Columbus, OH. 195 pp.
Fisher, T.R. 1989. The Dicotyledoneae of Ohio: Part 3, Asteraceae. Ohio State University Press, Columbus, OH. 280 pp.
Showman, R.E. & D.G. Flenniken. 2004. The Macrolichens of Ohio. Bulletin of the Ohio Biological Survey 14(3): 1-279.
Cooperrider, T.S. 1982. Endangered and Threatened Plants of Ohio. Ohio Biological Survey, Columbus, OH. 92 pp.
McCance, R.M. and J.F. Burns. 1984. Ohio Endangered and Threatened Vascular Plants: Abstracts of State-listed Taxa. Division of Natural Areas and Preserves, Department of Natural Resources, Columbus, OH.
Rose, M.A. 1998. Identifying Noxious Weeds of Ohio. Ohio State University, Columbus, OH. 23 pp.
Schaffner, J.H. 1910. The Pteridophytes of Ohio. Proceedings of the Ohio State Academy of Sciences 5(5): 265-305 (Special Paper #16). 40 pp.
Schaffner, J.H. 1917. The Grasses of Ohio. The Ohio State University Bulletin 21(28): 256-329 (Ohio Biological Survey Bulletin 9, Vol 2). 77 pp.
Schaffner, J.H. 1928. Field Manual of the Flora of Ohio. R.G. Adams & Co., Columbus, OH. 638 pp.
Taylor, C.J. 1967. The Lichens of Ohio. Ohio State University, Columbus, OH. 227 pp.
Weishaupt, C.G. 1971. Vascular Plants of Ohio: A Manual for Use in Field and Laboratory. 3rd ed. Kendall Hunt Publishing Co., Dubuque, IA. 292 pp.
Wolfe, J.N. 1940. A Catalog of the Lichens of Ohio, with Notes on Geographic Distribution in the State and a Key to 80 Genera. Ohio State University, Columbus, OH. 50 pp.
Aiken, W.H. 1911. Catalogue of the Ferns and Flowering Plants of Cincinnati, Ohio & Vicinity. Lloyd Library, Cincinnati, OH. 57 pp.
Braun, E.L. 1928. The Vegetation of the Mineral Springs Region of Adams County. Ohio Biological Survey, Columbus, OH. 134 pp.
Herrick, J.A., T.S. Cooperrider, & C.H. Hobbs. 1966. A Key To Spring Wildflowers of Kent and Vicinity. Kent State University, Kent, OH. 75 pp.
Andreas, B.K. 1989. The vascular flora of the glaciated Allegheny Plateau region of Ohio. Ohio State University, Columbus, OH. 191 pp.
Picture Guides and Specialty Books
Henn, R.L. 1998. Wildflowers of Ohio. Indiana University Press, 215 pp.
McKoewn, D. 2001. The Gardening Book for Ohio. Cool Springs Press, Nashville, TN. 448 pp.
McKoewn, D. 2005. Month-by-Month Gardening in Ohio. Cool Springs Press, Nashville, TN. 352 pp.
Tekiela, S. 2001. Wildflowers of Ohio Field Guide. Adventure Publications, Cambridge, MN. 410 pp.
Tekiela, S. 2004. Trees of Ohio Field Guide. Adventure Publications, Cambridge, MN. 254 pp.