Botanical name: Stachytarpheta cayennensis Family: Verbenaceae (Verbena family)
Synonyms: Stachytarpheta dichotoma, Stachytarpheta urticaefolia, Verbena 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.
Identification credit: CA Floristics
The flower labeled Blue Snakeweed is ...