Stachytarpheta jamaicens [syn. Stachytarpheta indica] is a species of plant in the Verbenaceae family. Native throughout the Caribbean, the species is commonly known as blue porterweed or Jamaica vervain. It is pantropical, being found in the Indian Subcontinent, Southeastern Asia and West Tropical Africa, where it is known as Indian Snakeweed and Nettle-leaved vervain. It is usually found along country roadsides and it grows also well as a ruderal plant on disturbed terrain. It is an invasive species in some places.
The fresh leaves are consumed in bush tea as a “cooling” tonic and blood cleanser, to treat “asthma” and “ulcerated stomachs”. Flowers are purple. Many species of butterflies are attracted to the flowers of the Indian Snakeweed.