Asperula, Ehrend. 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 : 11

Sect. Hexaphylla Ehrend. Perennial herbs, with or without subterranean stolons. Leaves in whorls of 6(7); cauline broadly lanceolate to linear, 1 -veined, without a distinct hyaline apex. Inflorescence pyramidal to corymbiform; partial inflorescences more or less capitate and involucrate; flowers with short pedicels or subsessile. Corolla 4-merous, hypocrateriform to infundibuliform, purplish or lilac to pink and whitish, glabrous and smooth or hairy outside; anthers and stigma often exserted. Ovary and fruit ovoid, hairy or glabrous, somewhat granulate.