Hibiscus brackenridgei is Hawai'i's State flower. Hibiscus brackenridgei can sometimes become a small tree growing up to 10 meters tall.
In the garden it is often grows to be a 1 to 3 meter tall shrub. Young plants have smooth tan trunks; the trunks of older plants have a wrinkled appearance. The fuzzy leaves have toothed edges, 3, 5, or 7 lobes, and are up to 6 inches long and equally wide.
The large flowers are 4 to 6 inches in diameter. They are yellow, generally with a maroon center, and form singly or in small clusters at the ends of the branches. The staminal column is yellow. Garnett reports that the flowers open between 2 and 4 p.m. and close between 9 a.m. and 1 p.m. Spring through early summer is the main blooming season with occasional flowers during the rest of the year. Garnett reports a flowering season of January through March for the subspecies found on O'ahu. The seeds of Hibiscus brackenridgei are contained in 3/8 to 3/4 inch oval capsules. The capsule is covered with soft hairs. It is dry and tan when mature and opens to release the seeds. The seeds are 1/8 inch long, kidney-shaped, and covered with fine hairs.
(Wagner,W.L.,Herbst,D.R.,Sohmer,S.H. 1990. Manual of Flowering Plants of Hawai'i.)
(Bornhorst.1996; Criley 1998.1999;Garnett.1988;Koob.1999)