ï~~2005
THE MICHIGAN BOTANIST
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NOTEWORTHY COLLECTIONS:
MINNESOTA AND WISCONSIN
David J. Schimpf and Deborah L. Pomroy
Olga Lakela Herbarium
Department of Biology
University of Minnesota
Duluth, MN 55812-3003
dschimpf@d.umn.edu
Rumex stenophyllus Ledeb. (Polygonaceae). Narrowleaf Dock.
Previous knowledge: Rumex stenophyllus is a herbaceous perennial native to
moist, often saline, soils from central Europe to central Asia (Live & Bernard
1958). Its known naturalized North American range (Live & Bernard 1958,
USDA 2004) comes nearest to Wisconsin in the Twin Cities area of Minnesota
(Ownbey & Morley 1991).
Significance. Two populations of R. stenophyllus were found in Superior,
Wisconsin, apparently the first known for the state. Both included numerous individuals in tall weedy herbaceous vegetation on upland clay soil. A soil test of
the Catlin site found the electrical conductivity to be 0.3 dS/m, which is a nonsaline value (Lal 2002).
WISCONSIN. DOUGLAS CO.: W of Catlin Ave., at ca. 2400 block, Superior, SE % Sec. 23,
T49N R14W, 27 Jul 2003, Schimpf 343 (DUL, SUWS, WIS); former petroleum tank farm,
Superior, SE %4 Sec. 16, T49N R14W, 27 Jul 2003, Schimpf 344 (WIS).
Acer platanoides L. (Aceraceae). Norway Maple.
Previous knowledge. Acer platanoides is a shade-tolerant, deciduous tree native to Europe and cultivated in North America (Gleason & Cronquist 1991). It
is escaped or naturalized in states east of Minnesota or in the Pacific Northwest
(USDA 2004), as well as in eastern Canada (Scoggan 1978). Although shown as
occurring outside of cultivation in Minnesota by USDA (2004), wild Minnesota
specimens of A. platanoides were not found in the collections at DUL or MIN
previous to this work.
Significance. Acer platanoides individuals over a full range of sizes were
found in wooded public land along Chester Creek, Duluth, Minnesota. This may
be evidence of naturalization in Minnesota, although cultivated seed sources remain nearby. A search of the similar ravine of Tischer Creek, about 2.5 km to the
NE, found no wild A. platanoides there.
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