Iris pseudacorus
Wetland, fen, marsh, waterside pasture, along woodland streams, beside ponds, lakes, and rivers. Flowers visited include white umbellifers, "Caltha", "Euphorbia", "Iris pseudacorus", "Menyanthes", "Mimulus guttatus", "Potentilla erecta", "Pyrus communis", "Ranunculus", "Sorbus aucuparia", "Taraxacum", "Viburnum opulus".