Galium, Koch. Perennial

Tutin, T. G., Heywood, V. H., Burges, N. A., Moore, D. M., Valentine, D. H., Walters, S. M. & Webb, D. A., 1976, Flora Europaea. Volume 4. Plantaginaceae to Compositae (and Rubiaceae), Cambridge University Press : 19

Sect. PLATYGALIUM Koch. Perennial dwarf shrubs or herbs, with a taproot, or with a rhizome and stolons. Stems with patent hairs or glabrous and smooth, mostly 4-angled. Leaves in whorls of 4 (with the stipules sometimes clearly smaller), usually with 3 parallel veins, rather obtuse. Inflorescence many-flowered, pyramidal to corymbose; ultimate branches ebracteate. Corolla usually rotate, sometimes infundibuliform, white to yellowish; lobes acute. Fruit dry, often with hooked or curved hairs, or glabrous.