Ageratum houstonianum is an annual member of the sunflower family (Asteraceae) prized in ornamental

Ageratum houstonianum is an annual member of the sunflower family (Asteraceae)prized in ornamental gardens for its blue fluffy flowers. Originating in Mexico and Central America it has made its way throughout the world, quickly becoming naturalized and invasive. I found this subject growing wild on a hilly roadside on Oahu right next to the previously posted Medinilla magnifica, and made a collection to photograph that night. One notable trait of this plant is that all parts contain toxic alkaloids which make it hazardous when consumed for humans, but especially for grazing animals apt to eat larger quantities of it.