Blue Snakeweed
Stachytarpheta cayennensis
Blue Snakeweed is a herb up to 1.2 m tall. Flowers are blue. This plant can easily be confused with Stachytarpheta jamaicensis. The plant has long tap roots. Leaves are opposite, thin, shallowly toothed. Flowers are borne in a terminal spike, embedded in the rachis, which is 1-3 mm in diameter. Flower-tube is curved, dark blue to whitish. Blue Snakeweed is native to south America, cultivated in various parts of the world.
Blue Rat's Tail, Brazilian Tea, Cayenne Snakeweed, Cayenne Vervain, Dark Blue Snakeweed, False Verbena, Joee, Nettleleaf Velvetberry, Rough-leaved False Vervain