Another other one for these conditions is Fritillaria meleagris, mine grows on the borders of my pond (in a mainly shady garden), always humid if not wet.. Snake's Head Fritillary (Fritillaria meleagris)
And still another one is Allium triquetrum that thrives very well in the same conditions.., very pretty for a long time for a bulb plant! Stinking Onions (Allium triquetrum)
