sentences:  During the years 1848 to 1856, George Engelmann made extensive studies of a plant he named "Echinocereus caespitosus".Prior to this Joseph zu Salm-Reifferscheidt-Dyck referred to plants in European collections as "Echinopsis pectinate var.reichenbachiana", and he later discussed the possibility with Engelmann that these two plants were one and the same.