| Galium microphyllum A. Gray, 1852 |
| Galium moranii Dempster, 1970 |
| Galium moranii subsp. aculeolatum (Dempster) Dempster, 1978 |
| Galium moranii subsp. moranii Dempster, 1970 |
| Galium nelsonii Greenm., 1898 |
| Galium nuttallii A. Gray, 1852 |
| Galium nuttallii subsp. nuttallii A. Gray, 1852 |
| Galium obstipum Schltdl., 1835 |
| Galium oresbium Greenm., 1898 |
| Galium orizabense Hemsl., 1879 |
| Galium ovale Ruiz & Pav., 1798 |
| Galium pendulum Greenm., 1905 |
| Galium pennellii Dempster, 1978 |
| Galium pilosum Aiton, 1789 |
| Galium porrigens Dempster, 1974 |
| Galium praetermissum Greenm., 1897 |
| Galium pringlei Greenm., 1898 |
| Galium proliferum A. Gray, 1853 |
| Galium punctatum Pers., 1805 |
| Galium puncticulosum Michx., 1803 |