Ageratina riparia (Regel) R.M.King & H.Rob.
Mistflower (Ageratina riparia) is a long-lived, perennial herb or subshrub that is native to Mexico, Central America and the West Indies. It was introduced to New Zealand as a garden ornamental and was first recorded in the wild (naturalised) in 1931. The plant typically grows 0.5–1.5 metres tall from a perennial rootstock. It has slender stems and narrow, toothed leaves arranged in opposite pairs. It flowers from August to January, producing dense clusters of small white flowers, which develop into black, five-angled seeds. It tolerates shade, damp conditions, salt, damage or grazing, and a wide range of soil types. It reproduces by seed and vegetatively from stems that root where they contact damp ground. Seeds are dispersed by wind, water and roadside mowing.
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