This grass, which, like the oil prepared from it, is called citronella, is a native of northern India, and is largely cultivated in Ceylon, where large quantities are worked for the oil; for this reason the grass itself is seldom met with in commerce. Its odor is somewhat similar to that of the Indian lemon grass, that of verbena, and that of several other aromatic plants, in place of which citronella is frequently employed. Much confusion exists in much of the current literature regarding the source and synonymy of the Indian grass oils and allied products. The following list contains the most important ones: 1. _Andropogon citratus_ DC.—Lemon Grass. The oil is known as Lemon Grass Oil, Indian Verbena Oil or Indian Melissa Oil, or simply Oil of Verbena or Oil of Melissa. 2. _Andropogon laniger_ Desf.—This is the Juncus odoratus or Herba Schoenanthi of older pharmacy. No oil is prepared from this. 3. _Andropogon muricatus_ Retz.—Cuscus or Vetiver. Source of Oil of Vetiver. 4. _Andropogon nardus_ L.—Citronella. Source of Oil of Citronella. 5. _Andropogon Schoenanthus_ L.—Ginger Grass. The oil is known as Oil of Ginger Grass, Oil of Geranium Grass, Oil of Indian Geranium or simply Oil of Geranium, also Oil of Rose Geranium [“Rose” is here a corruption of the Hindostanee name of the plant, viz., Rusa], Oil of Rusa Grass, Oil of Rusa, Oil of Palmarosa.—The two terms “Oil of Geranium” and “Oil of Rose Geranium” should be abandoned for this oil, to avoid confusion with the “Oil of (Rose) Geranium” obtained from Pelargonium. See under “Geranium.” CLOVE. _Latin_—Caryophylli; _French_—Clous de girofle; _German_—Nelkengewürz. This well-known spice comes from a tree, Caryophyllus aromaticus, native of the Moluccas, and largely cultivated at Zanzibar, Pemba, and elsewhere. It consists of the closed buds. The main essential of good quality is the greatest possible freshness, which may be recognized by the cloves being full, heavy, reddish-brown, and of a fatty aspect, and they must contain so much essential oil (about 18 per cent) that when crushed between the fingers the latter should be stained yellowish-brown. Before buying, this test should always be made, and attention paid to the fact whether the whitish dust is present in the wrinkles about the head. We have found in commerce cloves from which the essential oil had been fraudulently extracted with alcohol and hence were worthless; such cloves may be recognized by the faint odor and taste, but especially by the absence of the whitish dust. CUCUMBER. _Latin_—Cucumis sativus; _French_—Concombre; _German_—Gurke. The well-known fruits of this kitchen-garden plant, though not strictly sweet-scented, possess a peculiar refreshing odor which has found application in perfumery. Certain products belonging under this head require the odor of cucumber, and therefore this plant is to be included among the aromatic plants in a wider sense. CULILABAN BARK.