Botanical Description.--A tree, 6-8 meters high, covered with stellate groups of short yellow hairs. Leaves alternate, petiolate, rhomboid-oval or lanceolate, acuminate, 3-nerved, entire or slightly dentate, upper surface glabrous, lower surface covered with woolly hairs and powdery red glands. Flowers yellowish-green, small, dioecious, apetalous, in spikes. Staminate: By 3's in the axil of each bract; perianth, 3 or 5 deeply cut, lanceolate lobules; stamens 15-25, free, inserted in the center of the flower. Pistillate: In the axil of each bract; ovary, 3 locules each with 1 ovule, covered like the leaves with hairs and yellow, granular glands. Seed vessel globose, 3-celled, like ovary covered with hairs and glands. Habitat.--Mountains of Morong, San Mateo, Tarlak, Bosoboso, Ilocos Norte, Albay and Batangas. _Ricinus communis_, L. (Variety _microcarpus_, Müll.) Nom. Vulg.--_Tangantangan_, _Lingasina_, Tag.; _Tangantangan_, _Tawatawasinga_, Iloc.; _Castor Oil Plant_, Eng. Uses.--A purgative oil is expressed from the seeds, called "Aceite de Ricino" (castor oil). It operates mechanically in the intestinal tract and its action is rapid and is indicated whenever it is desired simply to empty the intestines without producing any irritating effect; it is, therefore, a purgative indicated in diseases of children, in pregnancy, and in hemorrhoidal congestions where a non-irritating evacuation of the rectum is desired. It is an anthelmintic, though not ordinarily given alone, but in combination with other drugs of a purely anthelmintic action, the object being to expel the worms which have been attacked by the specific. Oil extracted simply by expression is less purgative than that obtained by treating the seeds with bisulphide of carbon and absolute alcohol; also less purgative than the seeds themselves, because it contains only a very small proportion of a drastic principle existing exclusively in the seeds; this principle is completely dissolved in the oil extracted by chemical process. It is pale yellow in color, very viscid, with a characteristic mouldy odor. The purgative dose is 10-30 grams. A small dose may purge as actively as a larger one provided that the patient drink abundantly after the administration of the drug. The best method of disguising its taste is by giving it in half a cup of very strong, hot coffee. Just before the dose, take a swallow of coffee to disguise the taste even more effectually. Castor oil enters into the composition of elastic collodion (simple collodion, 30 grams, castor oil, 2 grams). The leaves pounded and boiled are applied as a poultice to foul ulcers.