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Robert L. Dressler
Comstock Pub. Associates 1993
: cloth , : pbk
Available at 5 libraries
Cambridge University Press 1993
Harvard University Press 1990
: pbk
Available at 2 libraries
Harvard University Press 1981
Available at 9 libraries
by Louis O. Williams and Paul H. Allen . by Robert L. Dressler
Missouri Botanical Garden 1980 Monographs in systematic botany from the Missouri Botanical Garden v. 4
Available at 3 libraries