Rumex obtusifolius, L.

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 : 87

43. R. obtusifolius L. , Sp. Pl. 335 (1753) .

Perennial 60-120 cm. Basal leaves large, twice as long as wide, thin, obtuse or subacute, cordate at the base; petiole slightly longer than lamina. Panicle open; branches arcuate; whorls mostly remote, the lower ones subtended by a leaf. Pedicels slender, up to 2| times as long as the valves, jointed near the base, readily deciduous. Valves variable in size, outline and tubercles. Europe except the extreme north and south. All except Cr Sb, but only as an alien in Az Is and perhaps elsewhere.

1 Valves entire or with a fewshortorindistinctteeth nearthebase,

all with tubercles (d) subsp. sylvestris 1 Valves with several distinct, often long teeth 2 Allvalveswithtubercles;tuberclesoftenunequal

(c) subsp. transiens 2 Onevalvewitha tubercle,theother twowithout 3 Valves6 mm,ovateor ovate-triangular,obtuse; leaves papillose beneath (a) subsp. obtusifolius 3 Valves5 mm,narrowlytriangularor Ungulate,acute;

leaves usually not papillose (b) subsp. subalpinus