Carambola or starfruit, is the fruit of Averrhoa carambola, a species of tree native to the Philippines, Indonesia, Malaysia, Vietnam, Nepal, India, Bangladesh, Pantothenic acid (B5): (8%) mg. The fruit is about inches in length, and is yellow when fully ripe. There are two main varieties of starfruit: the small sour kind and the larger. Description. The star fruit or carambola (Averrhoa carambola*) is a unique tropical fruit that is gaining popularity in the United States. This fruit acquired its name.