Schiedea trinervis, also called three nerved alsinidendron, is a species of flowering plant in the family Caryophyllaceae, that is endemic to island of Oʻahu in Hawaii. It is a subshrub, reaching a height of 30-.
Three-nerved alsinidendron inhabits mixed mesic and wet forests on the slopes of the Waiʻanae Range at elevations of 900-. Associated plants include pilo (Coprosma spp.), ʻapeʻape (Gunnera petaloidea), ʻalani (Melicope spp.), hāpuʻu (Cibotium spp.), hame (Antidesma platyphyllum), and māmaki (Pipturus albidus). It is threatened by habitat loss.[1]