We gratefully acknowledge the assistance of Professor Steven R. Hill, Plant Systematics, Division of Biodiversity and Ecological Entomology [DBEE], Illinois Natural History Survey for the identifications in this slide show. This is a rose. A common cultivar. A cultivar is a cultivated plant that has received a name under the International Code of Nomenclature for Cultivated Plants (the ICNCP, commonly known as the "Cultivated Plant Code").