Unknown plant, identification.

Hello new seedling here again. Spending time in the garden is great. I have a "rogue " plant which I haven't seen before. We have done a lot of clearing and cutting back,making more light. I found this plant,and another small one ,self seeded I assume, but have no idea what it could be. We have been In the house 15 years didn't plant it,not noticed it before. The excitement of gardening. Would really appreciate any thoughts. Your help on my shade predicament was really helpful. Attatched some photos to help identification.