Galium × ambiguum merupakan tumbuhan dari famili Rubiaceae (suku kopi-kopian). Nama ilmiah Galium × ambiguum pertama kali dipublikasikan oleh botanis Jean Charles Marie Grenier pada tahun 1850.
POWO (2024). "Plants of the World Online. Facilitated by the Royal Botanic Gardens, Kew. Published on the Internet; https://powo.science.kew.org/."
IPNI (2024). "International Plant Names Index. Published on the Internet http://www.ipni.org, The Royal Botanic Gardens, Kew, Harvard University Herbaria & Libraries, and Australian National Herbarium"
USDA - NRCS (2024). "United States Department of Agriculture - Natural Resources Conservation Service", Plant Profile.
