Galium proliferum, also known as limestone bedstraw, is a species of plant in the Rubiaceae family. It is native to Northeastern Mexico and the Southeastern United States. More specifically, it can be found in American states California (San Diego and San Bernardino County), southern Nevada (Clark County), southern Utah (Kane and Washington County), Arizona, New Mexico, Texas, as well as the Mexican states Coahuila and Nuevo León.
It is the sister group to Galium virgatum. It is also closely related to Galium texense and Galium circaezans, as can be seen in the following cladogram: