Hugonia mystax is a species of plant in the family Linaceae found mainly in the dry forests of peninsular India and Sri Lanka.

It is a scandent shrub, sometimes growing liana-like over other trees and bears yellow flowers and orange to red fruits in the rainy season.

The branchlets are leafless at the base and instead have a pair of recurved spines which bear a resemblance to a moustache, giving rise to the epithet mystax, Latin for moustache.

[1] The roots of the plant are astringent and bittersweet, and are used to treat fevers, verminosis, and inflammations.

[2] The species is common in the dry scrub and tropical dry evergreen forests of peninsular India south from Maharashtra to Orissa.