ponga /ˈpɒŋə/ noun1 •A medium-sized tree fern endemic to New Zealand, of species Alsophila tricolor (syns .Alsophila dealbata, Cyathea dealbata et al.).Hilltop behind hilltop, / A mile of green pungas / In the grey afternoon / Bow their heads to the slanting spears of rain. — 1972 formspongas