Opposite-leaved Golden Saxifrage is very common hereabouts in damp woodland
but Alternate-leaved is rare.
 Here you can see an image of the Chrysosplenium alternifolium found yesterday.
Looking at the single large leaf you can see how the leaf edge cuts in,
forming lobes, and the base is heart shaped. (Above)
In contrast the leaves of Chrysosplenium oppositifolium
have a wavy edge and the base tapers into the stem. (Below)

Chrysosplenium alternifolium has leaves branching off alternately (below).
Whereas Chrysosplenium oppositifolium bears leaves in opposite pairs.