Several later systems have spun off from the UNESCO system, most notably the USNVC system (Grossman et al., 1998) and the Land Cover Classification System, LCCS of FAO/UNEP (Di Gregorio & Jansen, 2000).
National Vegetation Classification (USNVC) system, and a listing of the 588 plant communities (termed "associations" in the USNVC) to be found in the Midwest.