Kling L. Anderson, Common names of a selected list of plants (1969)
“ Some genera have more than one common name, but in that case the genus is subdivided into different types, each with its own common name. For example, most species of the genus Panicum are called panicum, but certain others are witchgrass; Melica is melic, but bulbous species of that genus are called oniongrass; and Setaria is bristlegrass, but the name millet is applied to certain ones. Some poisonous species of Astragalus are called loco, but nonpoisonous ones are milkvetch and the selenium-gathering ones, poisonvetch. ”
