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 Hawai`i.

Habit
Trees up to 8 m tall. 

Leaves
Leaf blades 8-20 cm wide, (5)7-lobed or 9-lobed, lower surface pubescent near base and at apex of petioles, sometimes with nectaries on major veins, base cordate with a usually closed sinus.  Flowers  

Flowers
Pedicels 5-10 cm long; involucral bracts broadly ovate to suborbicular, 40-70 mm long, usually sinuately 3-5-lobed, apex obtuse; calyx irregularly 2-5-lobed, ca. 2.2-3 cm long, the lobes deciduous or sometimes persistent, the tube 1.5 cm long, densely yellowish pubescent, later glabrate except at base; petals scarlet, 9-11 cm long; staminal column up to 11 cm long.   

Fruit
Capsules ovoid, ca. 3 cm long, apex acuminate.   

Seeds
Seeds 12-15 mm long, ca. 0.8 cm wide, pubescent with hairs up to 3 mm long.   

Chromosomes
2n = 24*