Kadua cookiana (formerly Hedyotis cookiana) is a rare species of flowering plant in the coffee family known by the common names 'awiwi and Cook's bluet. It is endemic to Hawaii, where it is known only from Kauai, having been extirpated from Molokai and Hawaii. It is a federally listed endangered species of the United States. This is a small shrub with many short branches up to 20 centimeters long and lined with narrow leaves. It bears white flowers. It is gynodioecious, with an individual plant bearing either bisexual or all female flowers.