Ochna integerrima

Ochna integerrima, popularly called yellow Mai flower (Vietnamese: mai vàng, hoa mai, hoàng mai in southern Vietnam, although in the north, mai usually refers to Prunus mume), is a plant species in the genus Ochna and family Ochnaceae. In the wild, it is a small tree or shrub species (2-7 m tall). The timing of the yellow flowers of this plant make it very popular in southern Vietnam, where (often bonsai-style) plants are purchased during Tết. In Vietnam, the variety of O. integerrima whose flowers have five petals is called mai vàng (yellow mai), whereas mai núi (mountain mai) flowers have between five and nine petals. In Cambodia, it is called angkea (អង្គា), angkeasel (អង្គាសីល), angkea loeung អង្គាលឿង or kongkea គង្គា. Ochna integerrima (Thai: ช้างน้าว Chang nao) is the provincial flower of Mukdahan province, Thailand....read more on Wikipedia.