Wildlife Spotting

I found this plant curling up a branch of another plant. It's leafs have a opposite leaf arrangement. It's leaf margins were slightly dentate and slightly crenate. At its longest point, one leaf was 6cm. At its widest it was 4cm. The leaf shape was elliptical. It had a netted palmate leaf venation. The leaves were smooth. The stem was slightly hair, and curled up the branch of another, but did have roots that went into the ground.