High on the Blorenge above Abergavenny I found this little fellow lurking amongst the dead bracken fronds. I think its one of the Fumitory family, Fumariaceae and with triangular section leaflet stalks and ridged petiole it could be Climbing Corydalis Ceratocapnos claviculata. However this specimen lacks tendrils (will it develop them later in the season?) which is the main characteristic of this species and according to Stace it’s an annual (Poland and Clement say all year) and this one seems to be happy over wintering. According to Rose it is also supposed to be hairless but there are hairs on the leaflet stalks( Poland and Clement however say there can be hairs on the petiole.)
Interestingly although the leaflets appear entire the terminal leaflet lobe is mucronate and the edges have incredibly small fine teeth edge that is not visible with a x20 hand lens but do appear on the microscope. There are also very sparse translucent hairs in the leaf surface.