I photographed this Apiaceae from a distance as I risked falling in a fast flowing stream. I did the best I could. The lighting conditions were quite bad, heavy shadow which I managed to overcome with a Nikon on camera flash. Hope some member might recognise the plant even though there is a lack of detail of both flowers and fruit.
Thanks pathe, Angelica officinalis had occurred to me, I repeat, only occurred to me as a possibility. Without the inflorescence and fruit to help with the ID, I was at a loss.