Oh my word! Locally plentiful is the phrase which comes to mind on seeing these photos. We have certainly found that Erythronium of various species can take themselves to great depths but particularly E. americanum is of note in this respect. We have had it drop stolons at least 2 feet (60cms) to move down to a new level below a raised bed to colonise a new area. They did this during a period of purely vegetative propagation though now this whole colony is flowering well. This was a non-flowering clone which began here in NE Scotland to flower at the same time as a similar non-flowering group in the Gothenburg Botanic Garden did so. We have never been able to isolate the reason that happened. Other clones will flower from an early stage. Thank you for sharing, Roy. MY.