Beckmannia eruciformis subsp. eruciformis

Tutin, T. G., Heywood, V. H., Burges, N. A., Moore, D. M., Valentine, D. H., Walters, S. M. & Webb, D. A., 1980, Flora Europaea. Volume 5. Alismataceae to Orchidaceae (Monocotyledones), Cambridge: Cambridge University Press : 171

(a) Subsp. eruciformis :

Laxly caespitose, with creeping rhizomes. Basal internode of stems tuberous. Throughout most of the range of the species.