Muehlenbeckia astonii, common names shrubby tororaro and wiggy-wig bush, is an endemic New Zealand shrub, a distinctive ornamental plant in the Polygonaceae family. It is found only at the southern tip of the North Island (Palliser Bay) and on the eastern side of the South Island from northern Marlborough to Birdlings Flat at the south-west edge of Banks Peninsula, on the coast and on lowlands, especially terraced riverbeds. It has very small heart-shaped leaves (only a few millimetres) that grow in clusters of two or three, or alternate along the longer branchlets, and is leafless in winter.