The mokihana berry is the official island lei material of Kaua'i. The mokihana is a native citrus tree (Rutaceae Melicope anisata). Other common names for mokihana berry: alani, alani kuahiwi, mokehana. The leathery anise-scented fruit must be strung within a few hours of picking. Hawaiian women and men both wear the strung berries as leis and the anise-scented twigs and berries were once a favorite perfume (placed between the folds of tapa cloths). Each Hawaiian Island recognizes an official flower or lei material (as well as an official island color).

Mokihana belongs to the genus Pelea, derived from the Hawaiian goddess of the volcano, (Melicope Pele). Native to Kaua'i Island of Hawa'i, the mokihana grows to a height of 6 to 25 feet in moist to wet forests at elevations from 1,200 to 4,000 feet.

Source:

Meet the Plants: National Tropical Botanical Garden
Mokihana Plant: Kapi’olani Community College

Links:

State Flowers - 50 States List
National Flower