Abstract
MEHRHOFF, L. J. (George Safford Torrey Herbarium, Box U-43, University of Connecticut, Storrs, CT 062693043). Perennial Microstegium vimineum (Poaceae): An Apparent Misidentification? J. Torrey Bot. Soc. 127: 251-254. 2000. Microstegium vimineum (Trin.) A. Camas (Poaceae) is an aggressive non-native annual from Japan that was first reported in North America in 1919. It is now invasive throughout its range in eastern North America. A perennial form of M. vimineum was recently reported. The identification of these perennial individuals is questioned. It seems likely that individuals of the putatively perennial M. vimineum are really native Leersia virginica. Similarities and differences in morphology, habitat and phenology between the annual M. vimineum, the putatively perennial form and L. virginica are discussed. Comments on the spread and dispersal of M. vimineum are included. The importance of voucher specimens in botanical research is stressed.
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