For Galium
Allen, C.M. 2013. Notes on the identification and distribution of the species of the genus Galium (Rubiaceae) in Louisiana. J. Bot. Res. Inst. Texas 7: 509-513.
Braun, A.P. 2017. Vegetative key to Galium of Missouri. Missouriensis 34: 24-26.
Dempster, L.T. 1978. The genus Galium (Rubiaceae) in Mexico and Central America Univ. of Calif. Publ. in Botany 73: 1-33.
Dempster, L.T. 1981. The genus Galium (Rubiaceae) in South America II. Allertonia 2: 393-426.
Ehrendorfer, F., and M.H.J. Barfuss. 2014. Paraphyly and polyphyly in the worldwide tribe Rubieae (Rubiaceae): challenges for generic delimitation. Ann. Missouri Bot. Gard. 100: 79-88.
Ehrendorfer, F., M.H. Barfuss, J.F. Manen, and G.M. Schneeweiss. 2018. Phylogeny, character evolution and spatiotemporal diversification of the species-rich and world-wide distributed tribe Rubieae (Rubiaceae). PLoS One 13(12): p.e0207615.
Lipscomb, B.L., and G.L. Nesom. 2007. Galium anglicum (Rubiaceae) new for Texas and notes on the taxonomy of the G. parisiense / divaricatum complex. J. Bot. Res. Inst. Texas 1: 1269-1276.
Moore, R.J. 1975. The Galium aparine complex in Canada. Can. J. Bot. 53: 877-893.
Puff, C. 1976. The Galium trifidum group (Galium sect. Aparinoides, Rubiaceae). Can. J. Bot. 54: 1911-1925.
Puff, C. 1977. The Galium obtusum group (Galium sect. Aparinoides, Rubiaceae). Bull. Torrey Bot. Club 104: 202-208.
Reveal, J.L., C.R. Broome, M.L. Brown, and G.F. Frick. 2007. On the identities of Maryland plants mentioned in the first two editions of Linnaeus' Species Plantarum. Huntia 7: 209-245.
Rogers, G.K. 2005. The genera of Rubiaceae in the southeastern United States, part II. Subfamily Rubioideae, and subfamily Cinchonoideae revisited (Chiococca, Erithalis, and Guettarda). Harvard Papers in Botany 10: 1-45.
Soza, V., and R.G. Olmstead. 2010. Molecular systematics of tribe Rubieae (Rubiaceae): evolution of major clades, development of leaf-like whorls, and biogeography. Taxon 59: 755-771.
Stace, C. 2010. New flora of the British Isles, third edition. Cambridge Univ. Press, Cambridge. 1232 pp.
Yang, L.-E., Y. Meng, D.-L. Peng, Z.-L. Nie, and H. Sun. 2018. Molecular phylogeny of Galium L. of the tribe Rubieae (Rubiaceae) – Emphasis on Chinese species and recognition of a new genus Pseudogalium. Molec. Phyl. Evol. 126: 221-232.
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