If the ethereal tincture be evaporated a resinous residue remains that has not been studied, but appears to be the vesicant principle. This tincture should be made from the dried leaves to avoid hydration of the ether. Botanical Description.--A small plant with stem red, straight, quadrate, ramose. Leaves opposite, lanceolate, and fringed with hairs. Flowers axillary, small, red, solitary. Peduncles short. Calyx inferior, bell-shaped, with 8-toothed border, the 4 alternate teeth larger. Corolla none. Nectary bell-shaped, surrounding the ovary, shorter than the calyx, with 4 toothlets which lengthening form the filaments of as many stamens. Anthers 4-celled. Ovary of 4 pluriovulate locules. Style almost wanting. Stigma fluted. Seed vessel glabrous, horizontally dehiscent, containing 15 or more angular seeds joined to a common axis. Habitat.--It grows in the marshes of Mandaloyon. _Lawsonia alba_, Lam. (_L. spinosa_, L.; _L. inermis_, Roxb.) Nom. Vulg.--_Cinamomo del país_ (_native cinnamon_), Sp.-Fil.; _Henna_, _Camphire_, _Samphire_, Indo-Eng. Uses.--This is a very popular plant in the Orient, for many races use its leaves to impart a reddish-yellow stain to the nails, finger tips and palms of the hands. There is a tradition among the Mohammedans that the Prophet once called this plant "the best of all herbs." The leaf in form of a dry powder is sold in the bazars of India under the name of "henna"; mixed with water it gives it a yellow color, and when boiled the tone of the liquid becomes darker; the addition of an alkali turns it brown. In Persia they add indigo to this solution and use it as a hair dye. The Hindoos apply the bruised leaves to the soles of the feet of small-pox patients, their purpose being to prevent the spread of the eruption to the eyes. They also use it locally in a disease known among them as "burning of the feet." Grierson and Waring obtained good results in this disease by making a paste of the bruised leaves and vinegar; cases that resisted such treatment yielded completely to a brisk rubbing of the feet with a simple paste of the leaf. The decoction and the bruised leaves are also used locally for contusions. The bark has been given in jaundice, hypertrophy of the spleen, calculi of various sorts, leprosy and stubborn skin diseases, as an alterative. In decoction it is applied to burns. An English physician, Dr. Newton, made an extract of the leaves and flowers with which he pretended to cure leprosy; it was but one more useless drug in the long list used to combat that terrible disease. The dose of the extract is a teaspoonful daily, given in 2 doses. The juice of the leaves is given in sweetened water in some countries as a remedy for spermatorrhoea. The flowers are given in decoction for headache and the fruit is emmenagogue.