... leaves sessile, glabrous, lanceolate, the upper ones serrate, the lower ones almost entire. Flowers in racemes. Calyx, 4 sepals. Corolla, 4 rounded, unguiculate petals. Stamens 6, two of them short and the other four longer and united in pairs. Ovary flattened. Seed vessel quadrangular, nodular, glabrous, ... — The Medicinal Plants of the Philippines • T. H. Pardo de Tavera
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