Stephania tomentella is a herbaceous perennial vine of the Menispermaceae family and genus Stephania. It is native to Southeast Asia and was first described in Thailand in 1988 by L. L. Forman. It is one of 15 Stephania found only in northern Thailand, specifically in the area around Chiang Rai. It has leaves measuring 7–9 cm (2.8–3.5 in) in both width and length. It is commonly found amongst limestone rocks.