Overview
Kokia cookei, known in Hawaiian as ‘Cooke’s Kokiʻo’ or ‘Molokai Tree Cotton’, is universally recognized as one of the rarest and most miraculous plant species in botanical history. Once an integral component of the dry lowland forests of western Molokai, this stunning small tree with colossal, flaming-scarlet hibiscus-like blossoms was driven to near-extinction by the late 19th century. When the very last wild survivor burned in an accidental brushfire in 1978, the species was saved from permanent annihilation by a single twig salvaged hours before it died, grafted onto related Hawaiian trees.
Biology and Physical Characteristics
Kokia cookei is a small, deciduous tree or large shrub with smooth, pale greyish-brown bark and a compact, spreading canopy. Its leaves are shallowly five-to-seven lobed, rounded, and bright green, measuring 5 to 12 cm across, shedding during the dry summer season. The flowers are an absolute botanical spectacle: immense, solitary, bowl-shaped blossoms measuring 7 to 10 cm across with five reflexed, velvety, brilliant crimson-scarlet petals surrounding a central staminal column that drips with sweet nectar. The seeds are large, egg-shaped, and coated in dense, woolly golden-brown fibers resembling cotton, reflecting its close evolutionary kinship with cultivated cotton (Gossypium).
Behavior and Ecology
Naturally adapted to Hawaii’s dry lowland rain-shadow zones, Kokia cookei drops its foliage during prolonged summer droughts to conserve moisture, bursting into spectacular red floral displays in early summer. Its colossal scarlet blossoms were co-evolved specifically for pollination by native Hawaiian honeycreepers (Drepanidinae)—such as the ʻIʻiwi and now-extinct Molokai mamo—which inserted their long, curved bills into the deep floral cups to sip abundant nectar. Following the extinction of its native bird pollinators and widespread deforestation, natural seed set dropped to zero.
Conservation and Human Impact
Kokia cookei is classified as Extinct in the Wild on the IUCN Red List and federally endangered under the US Endangered Species Act. Discovered in the 1860s, it was decimated by deforestation for cattle ranching and browsing by feral goats and sheep. In 1915, a single wild survivor was discovered on Molokai; after that tree died in the 1970s, a lone graft was maintained at the Waimea Valley Arboretum. In 1978, that last tree was vandalized and burned, but botanists miraculously rushed in and took scion cuttings from a dying branch. Today, several dozen cloned grafted trees are carefully guarded in botanical gardens across Hawaii.
Interesting Factoid
Every living Kokia cookei tree on Earth today is a genetic clone that descended from a single scorched twig rescued by botanists from a burning tree in 1978, saving the entire species from permanent extinction with minutes to spare.