1. (noun) white rātā vine, Metrosideros albiflora, small white rātā, clinging rātā, Metrosideros perforata - vines with white, fluffy flowers. Metrosideros albiflora is found in northern North Island. Metrosideros perforata is a woody long-climbing vine. Leaves more or less circular, dark green above, pale green below, both surfaces covered in fineglandular spots (especially evident on leaf undersides). Flowers white (rarely pink) in dense, terminal, fluffy, clusters.