Hibiscadelphus are extremely rare dry forest trees, and most of the species are now extinct. The hibiscadelphus giffardianus here live at Kipuka Puaulu. A single plant was found in Kipuka Puaulu in 1911, which died in 1930. Note how the flower is a closed tube (about 3-4 inches long), unlike the more familiar hibiscus. Hibiscadelphus hualalaiensis is from the Pu'u Wa'awa'a area, and several giffardianus X hualalaiensis hybrids were removed from Kipuka Puaulu and Kipuka Ki to protect the genetic integrity of hibiscadelphus giffardianus. H. hualalaiensis is a much smaller plant and has a tiny flower, less than 2cm long.