Galium tricornutum Dandy
| A floristic survey of the Bear Trap Canyon, Madison County, Montana, with a discussion of author citations using the connecting words In or Ex P P Lowry (1981) Phytologia 49: 81-94 | |
| Phylogeny of the Rubiaceae-Rubioideae, in Particular the Tribe Rubieae: Evidence from a Non-Coding Chloroplast DNA Sequence Alessandro Natali, Jean-Francois Manen and Friedrich Ehrendorfer (1995) Annals of the Missouri Botanical Garden 82: 428-439 |