hā.puʻu ʻiʻi
n.
1. An endemic tree fern (Cibotium chamissoi, formerly called C. menziesii) much like the hāpuʻu and also known as hāpuʻu, but bearing stiff blackish hairs on the frond stems. (Neal 10–1.) Also ʻiʻi.
2. Dryopteris paleacea var. fusco-atra, a much smaller endemic fern (not a tree) with dark hairs at stems' base. Also ʻiʻi.