Hoya australis is a moderately vigorous climbing species. The leaves are thick and glossy and about 40-50 mm in diameter. The stems contain a white, milky sap. Flowers occur in clusters of up to 40, each on a long pedicel (stalk) and about 20 mm in diameter. They are borne on the same stalk in successive seasons and are fragrant, white in colour with deep red markings in the centre. The seed pods are long and slender, about 100 mm long containing a number of seeds.
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