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RHODORA, No. 387-390, 1992 Vol. 94, 880, pp. ARMORACIA LACUSTRIS (BRASSICACEAE) t OHIO REDISCOVERED IN McCormac James S. Ohio Key Words: Armoracia rediscovery, ecology, lacustris, (Lake which oc- mustard of aquatic habitats heterophyllous Cress) a is eastem south 95th meridian, from Pennsylvania and Virginia west to the Within Canada. this and and north to southern to Florida Texas, and has dispersed, broad irregularly distribution, A. lacustris is nineteen states in been from widely scattered localities reported hstmg candidate for I and two has been proposed as a provinces. It 1990) (Federal Register, threatened endangered or as federally nomencla- confusing due This taxon has a apparent to rarity. its ^ ^ A A ^ * j^^^ M . ^k — history Wieg ton) ) demon- and Bates (1987) Al-Shehbaz used Lake but for Cress, new combi- and proposed the name invalid, strated that this is & 1 Al-Shehbaz V. Bates. Gray) I nation Armoracia lacustris (A. 1936byF^oyd Ohio on 10 June Lake was in Cress collected last (Coopemder, 1982). County Pickaway Bartley near Circleville, Ohio since that time; There have been no reports of this plant in Ohio De- by the presumed extirpated as of 1990 was Hsted as it and Areas Pre- Natural of Resources (Div. partment of Natural from which date of almost all locations, Historical serves, 1990). Ohio counties known from eight are the nineteenth century, late Pick- Madison, Perry, Lucas, Lorain, (Coshocton, Licking, Erie, and mu, ny, os, mich, gh, ke, clm, away) based on surveys of by (3hio Armoracia in maps o{ lacustris PH. Published county dot Clark included and Easterly (1964) Al-Shehbaz and Bates (1987) specimen a could not locate County. County and omitted Perry I contams an 18yD and os County report, Clark to substantiate the Perry Moser M. A. Mary Mapl Mercer < numerous ro- and sterile plants 80 which contained fertile ca. 1 growing 387 388 Rhodora 94 [Vol. dated, diassociated channel of the and were flowering and river, fruiting vigorously. Marys St. River is a moderately large stream of low gradient (2.9' per mile) (Div. of Water, 1960) which originates in western Auglaize County, Ohio and and flows west north confluence to its Maumee maj River, a Marys the char; well-forested St. is noodplam with numerous oxbows and buttonbush swamps; it i one of the few remaining unchannelized western Ohio rivers in Mau Near Wayne, known Fort Indiana, a low-lying divide as the mee Terrace Marys and Wabash separates the drainage St. (Thombury, 1958). During periods of extreme flooding, water from Marys the drainage unite with the Mississippian drainagi St. Wabash migratory corridor Mississippi Wabash and central eastern Indiana (Deam, 1940). Additional field surveys of the Marys River area during June St. and by Moser and July myself of separate located a total six populations of Armoracia lacustris (Figure distributed in all 1), Ohio three counties through which Marys the flows (Auglaize, St. Van Mercer, Wert). These from two populations range in size ca. dozen 1000+ plants to plants scattered over two to three acres a Mercer at site in County. All populations occur in old river now channels from isolated the Marys except during periods St. of when flooding, they The oxbows are temporarily inundated. which in A. grows woodlands lacustris are in semi-open riparian dominated by Acer saccharinum and Fraxinus pennsyJvanka L. Marsh.; Cephalanthus occidentalis L. always present in the is wettest sections of these oxbows. Typical herbaceous associates Muhl Wahlenb Michx., L. oryzoides Michx S liflora (Nutt.) Hitchc, amolus Jloribundus Saururus mid- June, surface and habitat, Armoracia lacustris was growing in a soft, thick, muddy substrate in a loosely defined zone along the periphery of McCoTimLC—Armoracia 389 1992] \ W«YHF r T, / Ohio showing pre- 1937 rec- Figure Distribution q{ Armoracia laciislm in 1, I ords (), and 1991 collection sites (•). and outnumbered flowering each oxbow. greatly rosettes Sterile fruiting plants fruits by was mostly, not entirely, populations if production these in means and muck, they send out roots soon onto the soft after falling LaRue on moist and placed collected regeneration leaves in detail; I The percentage of «kn and formed nnttina rosettes. cnil rrintpd survive ! known i 'moracia lacustris ( \ NY MU, MICH, KE. 390 Rhodora 94 [Vol. ACKNOWLEDGMENTS W. W. thank A. Cusick and Stoutamire I P. for their helpful and acknowledge comments of two suggestions, gratefully the anonymous reviewers. LITERATURE CITED Al-Shehbaz, AND A. V. Bates. 1987. Armoracia lacustris (Brassicaceae), the I. name 357- correct for the North American Lake Cress. Arnold Arbor. 68: J. 359. CooPERRiDER, T. A., Ed. 1982. Endangered and threatened plants of Ohio. Ohio OH. Biol Surv. Bull. Notes No. Columbus, 16, Deam, C. C. 1940. Flora of Indiana. Dept. of Conserv., Div. of Forestry, Indi- anapolis, IN. Division of Natural Areas and Preserves. 1990. Rare native Ohio plants. 1990-91 status Ohio Dept. of Nat. Res., Columbus, OH. list. Division of Water. 1960. Gazeteer of Ohio streams. Ohio Dept. of Nat. Res., OH. Columbus, W, Easterly, N. 1964. Distribution patterns of Ohio Cruciferae. Castanea 29: 164-173. Federal Register. 1990. Dept. of the Interior, U.S. Fish and Wildlife Serv. Vol. No. Washington, DC. 50, 35, W. Greene, C. 1935. The distribution of Wisconsin Wisconsin Conser- fishes. vation Commission, Madison, WI. LaRue, C. D. 1942. Regeneration in Radicula aquatica. Pap, Michigan Acad. 51-60. Sci. 28: Thornbury, W. D. 1958. The geomorphic history of the Upper Wabash valley. Amer. 449-469. 256: Sci. J. OHIO DEPARTMENT OF NATURAL RESOURCES DIVISION OF NATURAL AREAS AND PRESERVES FOUNTAIN 1889 SQUARE, BLDG. F COLUMBUS, OH 43224