Urtica dioica ssp. gracilis (American stinging nettle) with their toothed, heart-shaped leaves en masse next to the trail. Mostly, as here, they weren't too hard to avoid. Rather attractive, actually, when massed like this. Just don't touch.
2015CA CoastCA Far NorthUrticaUrticaceaePF
From Sinkyone Wilderness State Park - May 2015