Streblus asper is a tree known by several common names, including Siamese rough bush, khoi, serut, and toothbrush tree. It is a medium-sized tree native to dry regions in Thailand, India, Malaysia, and Vietnam.
In the Republic of the Philippines, it is commonly known as "bogta-e" or "bogtalay"
The leaves are 2 to 4 inches long, rigid, oval-shaped, irregularly toothed, and borne on small petioles. staminate flower heads are spherical with minute flowers. pistillate flowers have longer peduncles.