Sida fallax is a native Hawaiian species of plant that grows on many of the Hawaiian islands in both coastal and inland ecosystems. Since this plant grows in two very different ecosystems, the characteristics of the plant differ greatly. Coastally, Sida fallax grows prostrate, or flat and spread out, and has small and dense (succulent-like) leaves with rounded teeth. Inland, Sida fallax grows more erect and has large thin leaves with serrate, or sharp, teeth. The two ecotypes of this plant are very different morphologically, and yet are classified as the same species. We are also aware that hybrids of these two ecotypes are possible but do not tend to appear naturally in the field. It is important to distinguish how morphologically different these two ecotypes are, establish the morphology of a hybrid, and establish species/ecotype identifying methods. This work establishes the morphological differences in the leaves of the two ecotypes, how their reproductive morphology differs, and what method of identifying morphological differences is most comprehensive and descriptive in this species of plant. This work is helpful in order to determine conservation methods and gather a greater understanding of evolution with a unique lens, since Hawaii is a relatively young archipelago.