Hawaiian pupu shell necklace; photo by catheroo (cat edens) on Flickr (noncommercial use permitted with attribution / share alike).
Official Island Lei Material of Ni'hau
The Hawaiian island of Ni'hau recognizes pupu (tiny seashells) as the official island lei material (also called pä pä, kahelelani, momi, and laiki). All Hawaii Symbols
Official Island Flowers or Lei Material
In addition to Hawaii's state flower, each Hawaiian island designates an official island color and an official flower or lei material: Hawaii - red pua lehua ('ohi'a blossom); Maui - lokelani (pink Damask rose); O'ahu - pua 'ilima; Kaua'i - mokihana berry; Moloka'i) - Pua Kukui (blossom of candlenut tree); Lāna'i) - kauna'oa (native dodder); Ni'hau) - pupu (tiny seashells); and Kaho'olawe - hinahina (native beach heliotrope).