No thorns.

According to the Flora of China, we learned that the sweet and sour horn tree has no thorns, dark gray bark, irregular longitudinal lobes, small leaves, oblong, and hairless.

Tamarindus tamarind is an evergreen tree of the genus Tamarindaceae. It is a variant of tamarind. The tamarind is shaped like a pod, tastes sour and sweet, and the pods are red when mature.