Polygonum, (Miller) DC. Herbs. Ochreae

Tutin, T. G., Heywood, V. H., Burges, N. A., Moore, D. M., Valentine, D. H., Walters, S. M. & Webb, D. A., 1964, Flora Europaea - Volume 1. Lycopodiaceae to Platanaceae, Cambridge University Press : 79

Sect. Persicaria (Miller) DC. Herbs. Ochreae brownish, entire or ciliate but not lacerate. Flowers in spikes; bracts few and inconspicuous. Perianth usually petaloid; stamens 5-8; styles 2, rarely 3, united below. Nut lenticular, rarely trigonous.