Polygonum

Meikle, R.D. 1985: Flora of Cyprus 2Tutin, T.G., Burges, N.A., Chater, A.O., Edmondson, J.R., Heywood, V.H., Moore, D.M., Valentine, D.H., Walters, S.M. & Webb, D.A. 1993: Flora Europaea 1, ed. 2
but modified
1Perennial plant with woody rootstock, sometimes even like a subshrub
1'Annual plant
2Inflorescences leafy, the flowers in small axillary clusters; leaves coriaceous
2'Inflorescences spiciform, terminal, slender, not leafy; leaves not coriaceous
3Inflorescences leafy; flowers solitary, axillary, or in small axillary clusters; bracts leaf-like, longer than the flowers
3'Inflorescences not leafy, spiciform; at least the upper bracts inconspicuous and shorter than the flowers
4Perianth pink and white
4'Perianth green, sometimes with pink or white margins