Cranfillia fluviatilis, synonym blechnum fluviatile, is a fern known in the māori language as kiwikiwi. a herbaceous plant, c. fluviatilis is a "hard fern" of the genus cranfillia in the family blechnaceae. it was identified by patrick brownsey in 1979. other common names are star fern, creek fern, kawakawa and kiwakiwa.
Source: Wikipedia