Wagner, Warren L., Derral R. Herbst and S. H. Sohmer. 1999. Manual of the Flowering Plants of Hawai'i (Bernice Pauahi Bishop Museum Special Publication, 2 Vol. Set). Honolulu, HI

Flora of Hawaii:  

Distribution    
In the Hawaiian Islands, endemic to O`ahu, Lana`i.

Habit
Compact shrubs or sometimes shrubby trees 1.5-2.5 m tall.

Leaves
Leaves coriaceous, oblong-elliptic to elliptic, sometimes elliptic-ovate or elliptic-obovate, strongly to moderately concave, 3-10.5 cm long, 2-5 cm wide, lateral veins strongly to moderately impressed, spreading, moderately to strongly arcuate, higher order venation relatively inconspicuous to conspicuous, upper surface glabrous, lower surface moderately to sparsely short-hirtellous, sometimes only along principal veins, margins revolute, apex obtuse to rounded and then usually with a short-cuspidate tip, base rounded to weakly subcordate, petioles 0.1-0.6 cm long, stipules 3-5 mm long, adnate to petioles only at base. 

Flowers
Flowers in terminal, congested, paniculate inflorescences 1.3-5 cm long, peduncles 10-13 mm long, usually hispidulous, secondary branches ± hispidulous, pedicels 0.8-3 mm long, usually glabrous; calyx lobes deltate, 1-1.4 mm long, spreading, glabrous; corolla green, the tube sometimes purple, fleshy, fusiform in bud, salverform, the tube (4.3-)5.5-11 mm long, glabrous, the limb gradually expanded, weakly quadrangular, the lobes linear, 3-6 mm long, each with a terminal fleshy appendage. 

Fruit
Fruit drupaceous, dark blue to purplish black, 4-7 mm in diameter, the persistent calyx lobes strongly spreading.