Sisymbrella aspera subsp. aspera

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 : 283

(a) Subsp. aspera :

Moist, sandy soil, often near streams. Most of Spain except the south; Portugal; S. & W. France.

Highly polymorphic in Spain where populations are largely intermediate between (a) and (b).