Baccaurea angulata, commonly known as belimbing hutan (jungle starfruit), belimbing darah (blood starfruit) or belimbing dayak (Dayak starfruit), is a tropical fruit-bearing tree in the family Phyllanthaceae. It is native to the primary rainforests of Borneo, specifically recognized for its prominence in the traditional diets and agroforestry systems of the indigenous Dayak people. The genus name Baccaurea is derived from the Latin bacca ("berry") and aurea ("golden"), reflecting the color of some fruits within the genus, while the species epithet angulata refers to the distinct, angular or "winged" shape of the fruit pods. Historically, this plant has been a vital wild-harvested resource in the deep interiors of Borneo, often found growing in mixed forest environments where it is protected and managed by local communities due to its culinary and medicinal value.

The plant is a mid-sized, slow-growing evergreen tree that typically thrives under the humid, shaded canopy of tropical rainforests. Its most remarkable feature is its cauliflory—the botanical phenomenon where flowers and fruits emerge directly from the trunk and older, thick branches rather than from young, peripheral twigs. The fruits develop in clustered, dangling racemes that resemble strings of angular, vibrant lanterns. When immature, the fruits are a dull green; as they ripen, they transition into a striking, deep reddish-purple or maroon color. The fruit is technically a berry, possessing a thick, leathery, and distinctly ribbed exterior that must be manually cracked or sliced open to reveal the edible, segmented, cream-colored pulp inside, which surrounds several seeds.

Baccaurea angulata is cherished in local Bornean gastronomy for its refreshing, tangy-sweet flavor profile, often likened to a fusion of mangosteen and tamarind. The pulp is succulent, juicy, and offers a pleasant, palate-cleansing acidity that makes it a favorite snack during the hot, humid afternoons of the rainforest. In traditional Dayak culinary practice, the fruit is eaten fresh, but it is also frequently used as a souring agent in spicy fish curries (masak asam) or fermented into traditional preserves. Because of its thick, tough rind, the fruit possesses a surprising degree of shelf stability compared to other tropical rainforest berries, allowing for local trade and transport from the deep jungle to village markets.

Nutritionally, the belimbing dayak is a modest but significant source of dietary fiber, Vitamin C, and water-soluble minerals, providing essential hydration and micronutrients in the tropical diet. Its biochemical profile is defined by a high concentration of specialized phenolic compounds and flavonoids, which contribute to its tartness and provide potent antioxidant effects. The leaves and bark of the tree contain saponins and tannins, which have been historically utilized in traditional medicine as a treatment for digestive inflammation and skin ailments. Modern ethnobotanical research into the Baccaurea genus continues to uncover potential anti-inflammatory and hepatoprotective properties within its seed and pulp extracts.