Celtis tetrandra, commonly known as the Nilgiri elm, is a species of flowering plant in the hemp family, Cannabaceae. This tree is recognized for its distinct botanical features and its presence within its native ecosystems. The Nilgiri elm is a deciduous tree that can reach moderate to large sizes, typically growing to heights of 15 to 25 meters, with some specimens potentially exceeding this. Its growth habit is generally upright, forming a spreading crown. The leaves are simple, alternate, and ovate to elliptical in shape, measuring approximately 5 to 12 centimeters in length and 3 to 6 centimeters in width. They possess a serrated margin and a pointed apex, with a smooth or slightly rough texture on the upper surface and a paler, often hairy, underside. In autumn, the foliage typically turns a yellow or yellowish-brown before abscission. The flowers of Celtis tetrandra are inconspicuous, greenish, and borne in fascicles or short cymes, appearing in the leaf axils. These flowers are typically unisexual, with male and female flowers often found on the same tree, indicating it is monoecious. The fruit is a small, fleshy drupe, globose to ovoid, measuring about 5 to 8 millimeters in diameter. These drupes are initially green, ripening to a dark purple or black color, and are often borne in clusters. The bark of mature trees is generally smooth and grayish, becoming somewhat fissured with age. Celtis tetrandra is native to the Indian subcontinent, specifically found in the Western Ghats and parts of the Eastern Ghats of India, as well as Sri Lanka. It thrives in moist deciduous forests and evergreen forests, often found at mid-elevations. The species prefers well-drained soils and can tolerate a range of light conditions, from partial shade to full sun, though it typically flourishes in areas with adequate moisture. Cultivation requirements outside its native range would necessitate similar conditions, focusing on moist, well-drained soil and protection from extreme cold. While specific documented uses for Celtis tetrandra are not widely detailed in general botanical literature, trees within the Celtis genus are known for their timber, which can be used for construction and fuel. The fruits of some Celtis species are edible, though the palatability and use of Celtis tetrandra fruits are not extensively recorded. Ecologically, the fruits likely serve as a food source for local wildlife, contributing to seed dispersal. The tree's presence in forest ecosystems plays a role in habitat structure and biodiversity. Interesting adaptations may include its ability to thrive in the humid, often shaded understory of its native forests, and its deciduous nature, which allows it to conserve resources during drier periods or cooler seasons.