General Information:
Distribution  
In the Hawaiian Islands, endemic to Kaua`i, O`ahu, Moloka`i, Lana`i, Maui, Hawai`i. In the Hawaiian Islands, endemic to Kaua`i, O`ahu, Moloka`i, Lana`i, Maui, Hawai`i.   

Habit
Trees up to 35 m tall.

Leaves
Leaves reduced to phyllodes, these narrowly elliptic and usually strongly falcate, 7.5-26 cm long, 0.5-2.5 cm wide, bipinnately compound leaves of various sizes present at apex of small phyllodes in sapling stages.

Flowers
Flowers ca. 2 mm long, in heads ca. 8 mm in diameter (excl. stamens), these few together in axillary racemes or sometimes aggregated into terminal leafy panicles, peduncles ca. 1 cm long; corolla cream-colored; stamens curled, more than twice as long as corolla; ovary pubescent.

Fruit
Pods flattened, oblong, 8-30 cm long, 0.8-2.5 cm wide, sutures straight or occasionally constricted between some of the seeds.

Seeds
Seeds ellipsoid, laterally flattened, either transversely or longitudinally arranged, 6-12 mm long, 4-7 mm wide.

Chromosomes
2n = 26*, 52*