Sagina procumbens subsp. procumbens

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 : 147

(a) Subsp. procumbens :

Flowers usually 4-merous. Sepals broadly ovate, usually patent in fruit; petals usually minute or absent. Throughout the range o f the species.