Abstract

• The morphological, histological and phytochemical studies were carried out at Botany Department, University of Yangon in 2019. According to morphological study, it is a tree with bipinnately compound leaves, pulvinus and leaf-like stipules present. Flowers are slightly zygomorphic and predominantly orange-red in color. Lower surface of sepals is green and upper is red. Four smaller petals are orange-red and one larger petal is white and yellow with reddish spots. In histological study (Trease and Evans, 2009), stomata present on the lower surface of sepals. Anthocyanin containing epidermal cells present only on the upper surface of sepals. In petals, anthocyanin containing cells present on both epidermis. Bundle sheath and starch sheath present in petals. In phytochemical study (Harborne, 1973, Sofowora, 1993 and Trease and Evans, 2009), reducing sugars, alkaloids and saponins were not detected in petals. Antioxidant activities were determined by DPPH assay (Blois, 1958 and Brand-Williams et al., 1995) at Botany Department, University of Mandalay in 2020. The IC50 value of sepals was 6.44 μg/ml and petals was 20.04 μg/ml.