909. The names of the Orders arc Latin adjectives (feminine, plural, to agree with plantae, plants, understood), usually derived from the name of the most prominent, or leading genus, in each, by changing or prolonging the termination into aceae, as Rosaceae, the rose tribe, Papaveraceae, the poppy tribe, from Rosa and Pa-paver. Earlier names, however, derived from some leading character in the order, and with various terminations, are still retained. Thus, Compositae, with compound flowers; Labiatae-, with labiate flowers.

910. Generic names are Latin substantives, arbitrarily formed, often from some medicinal virtue, either supposed or real, or from some obvious character of the genus; sometimes from the native country of the plants, or from the name of some distinguished botanist, or patron of botany, to whom the genus is thus said to be dedicated. Also the ancient classic names, either Latin or Greek, are often retained. Examples of all these modes of construction will be hereafter seen.

911. Specific names are Latin adjectives, singular number, and agreeing in gender with the name of the genus to which they belong. They are mostly founded upon some distinctive character of the species; as Gerardia glauca, glaucous-stemmed Gerardia; G. purpurea, purple-flowered Gerardia; G. tenuifolia-, slender-leaved Gerardia. Frequently the species is named after some other genus, which, in some respect, it resembles; as Gerardia quercifolia, oak-leaved Gerardia. G delphinifolia, larkspur-leaved Gerardia.

912. Commemorative specific names. Species, like genera, are also sometimes named in commemoration of distinguished persons. The rules given by Lind-ley, for the construction of such names, are, 1st. If the person is the discoverer, the specific name is a substantive in the genitive case, singular number; as, Lobelia Kalmii, Kalm's Lobelia; Pinus Fraseri, Fraser's pine. 2d. If the name is merely conferred in honor of the person to whom it is dedicated, it is an adjective ending