Relbunium asperum Relbunium diffusum Relbunium hypocarpum f. denticulata Relbunium noxium Relbunium noxium var. pilcomayense Relbunium valantioides Rubia aspera Rubia diffusa Rubia noxia Rubia valantioides Galium noxium subsp. valantioides Galium paratyense Galium noxium subsp. noxium Relbunium diffusum var. glabrum
World Flora Online, http://www.worldfloraonline.org/, accessed June 20, 2024