Not surprisingly, the first flower that has “bloomed”, so to speak, along the river is a dandelion look-alike. For whatever reason, the stems of these flowers give me the creeps. I am pretty sure they are coltsfoot ( Tussiago farfara ) based on their general look and time of blooming.
They are very hardy and I have seen them growing near our house in very loose gravel. They’re about 2-3″ tall at the moment but will grow quite a bit larger … and spread.