Udara blackburnii
Udara blackburnii, the Blackburn's bluet, green Hawaiian blue or Hawaiian blue, is a butterfly in the family Lycaenidae. It is endemic to Hawaii.
The wingspan is 22–29 mm.
The larvae feed on Acacia species, Pithecellobium, Samanea saman, Perottetia sandwicensis, Dodonaea viscosa and Pipturus albidus.