Galium rivulare, Boiss. & Reuter

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 : 30

95. G. rivulare Boiss. & Reuter , Diagn. Pl. Nov. Hisp. 15 (1842).

Like 94 but green to brownish when dry, with long, subterranean stolons; stems (15-)2O-6O(-8O) cm, often more than 1 mm in diameter, with white angles, mostly with patent hairs as well as retrorsely aculeolate, or subglabrous; middle internodes l|-4 times as long as leaves; leaves (ll-)14-25(-30)x (l-4-) l-6- 2-8(-3-8) mm, in whorls of 6(-8), usually 7^-10 times as long as wide, very thin, somewhat paler beneath; inflorescence ovoid-oblong; pedicels c. 1 -3 mm, slender; corolla 2-2-8 mm in diameter; fruit dull. 2л = 22. Damp or shady placesfrom the coast to the mountains. • N. & C. Spain, N. Portugal. Hs Lu.

Populations at high altitudes tend to be glabrous.