Botanical Description.--A vine very well known by its blue flowers. Leaves alternate with 3 pairs of oval leaflets. Stipules persistent. Flowers axillary, solitary, 1-1 1/2' in long diameter. Calyx in 5 acute divisions, the two upper ones smaller. Corolla papilionaceous. Standard open, notched at the end. Keel shorter than the wings and covered by them. Stamens 10, 9 united and 1 free. Stigma downy, thick. Pod full of short hairs, with more than 6 surrounded with a tow-like substance, reniform, with black spots. Habitat.--Common along the roads and in gardens. Flowers in July and November. _1. Pterocarpus santalinus_, L. [5] Nom. Vulg.--_Narra_, _Naga_, Tag.; _Apalit_, _Daytanag_, Pam.; _Red Saunders_ or _Red Sandalwood Tree_, Eng. _2. P. Indicus,_ Willd. (_P. pallidus_, Blanco.) Nom. Vulg.--_Asana_, Tag.; _Naga_, Vis. _3. P. erinaceus_, Poir. (_P. echinatus_, Pers. & DC.) Nom. Vulg.--_Asana_, _Narra_, Tag. Uses.--The wood of the first is the so-called "red sandalwood." It is used for building purposes and, in medicine, as an astringent. In decoction it is used as a gargle for sore throat. The second is also an excellent building material and is used medicinally for its astringent properties. A decoction of sufficient strength to color the water a light blue is used as a mouth wash in toothache and has some reputation as a solvent of vesical calculi. All three species yield a resin known in pharmacy under the name of "kino." The true gum kino is really produced by the _P. marsupium_, Roxb., but the Philippine product, especially that of the second and third species, has for a long time been exported to Europe under the name of "red astringent gum" or "kino." This name is given to the sap of these trees dried without the aid of artificial heat. The bark is the part which produces it and the following extractive process is employed in Madras: a vertical incision is made in the trunk and lateral incisions perpendicular to it and a receptacle is placed at the foot of the tree. This soon fills and when the gum is sufficiently dried by air and sun it is packed in boxes and exported. In respect to appearance, solubility and chemical composition, Flückiger and Hanbury were unable to discover any difference between the kino of _P. marsupium_, Roxb., and that of _P. erinaceus_, Poir. It is therefore interesting to consider a product that is identical with that described in the pharmacopoeias as produced by the _P. marsupium_, Roxb., though the latter does not grow in the Philippines. Kino is at present used but little in therapeutics and its action is analogous to that of tannin and catechu. It is given internally for its astringent effect in chronic diarrhoea, leucorrhoea, blenorrhoea and hemorrhages. The dose of the powder is 1-4 grams, and of the alcoholic tincture, containing 20 parts kino to 100 of alcohol, 5-10 grams. In prolapse of the rectum and anal fissure the following solution is used by enema: