Definition of genus:
- A class of objects divided into several subordinate species; a class more extensive than a species; a precisely defined and exactly divided class; one of the five predicable conceptions, or sorts of terms.
- An assemblage of species, having so many fundamental points of structure in common, that in the judgment of competent scientists, they may receive a common substantive name. A genus is not necessarily the lowest definable group of species, for it may often be divided into several subgenera. In proportion as its definition is exact, it is natural genus; if its definition can not be made clear, it is more or less an artificial genus.
- "Himalayan Journals V2.", J. D. Hooker.
- "Sketches of the Natural History of Ceylon", J. Emerson Tennent.
- "Herbal Simples Approved for Modern Uses of Cure", William Thomas Fernie.