Now that var. angustifolia. is ranked as Cardamine polemonioides
there's no reason to keep var. pratensis.
Cardamine var. pratensis has to be considered at species rank aswel now
"FNA (vol. 7, 2010) elevates Cardamine pratensis var. angustifolia (= C. nymanii) to full species. Therefore according to FNA, Kartesz's (1994) C. pratensis var. pratensis is equivalent to C. pratensis." (連結)