Summary

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.
Source: Gutenberg

Kling L. Anderson Common names of a selected list of plants (1969)

Species Common Names
The common name for an individual species is a contraction of the genus common name and, in most cases, a descriptive adjective for a particular species. An example is the common name for Bromus inermis The common name for the genus is brome and the descriptive adjective associated with the species name inermis is smooth, hence smooth brome is the common name for that species.
Source: Gutenberg

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