The Coprosma genus spans across the Pacific Islands and Australia with several species endemic to Hawaii being known. Originating from two colonization events, most likely from New Zealand, 13 Coprosma species were discovered in Hawaii. This is a result of Coprosma’s ability to easily occupy different niches as well as its inherent phenotypic plasticity. While this allows Coprosma to enjoy maintaining a foothold after colonization through adaptive radiation, it poses a problem in species delimitation among populations that may not be immediately apparent. One particular species, Coprosma foliosa, is composed of a complex of populations that have already had two species, C. stephanocarpa and C. cordicarpa, delineated in 2015. Unique populations within these complexes face potential for extinction, or loss of specific characteristics, if not identified due to hybridization and competition. Using morphometric analysis methods; such as landmarks, traditional shape descriptors, and elliptical fourier descriptors (EFDs); we hope to form distinct groupings of C. foliosa populations when analyzing and comparing their leaves. Intense investigations of these populations will give support to or against their delimitation from C. foliosa and provide insight into their vulnerability to extinction that land managers can take into account. We will also do a phylogenetic analysis to render more support to species delimitation of each population as well as produce a phylogenetic tree to observe relations between distinct groups, if found, and other Coprosma species endemic and not. We hope to fill a gap in phylogenetic knowledge of endemic Coprosma species in Hawaii as well as provide insight into adaptive radiation in the Pacific.