Homalanthus polyandrus is a species of plant in the family Euphorbiaceae. It is endemic to New Zealand.
Homalanthus polyandrus is a slender tree or shrub, 3âÂÂ7 m tall. Branches brittle. Leaves of younger plants are up to 30 cm in diameter; of adult plants 5âÂÂ10 cm long. Racemes slender and erect, 10âÂÂ20 cm long, Male flowers are numerous, about 2 mm in diameter. There are 1âÂÂ5 female flowers at the base of the raceme, on quite long, slender pedicels.