This horrible weed feeds pollinators

Leafy spurge (Euphorbia esula): it's a much-hated, non-native plant, listed as a noxious weed by the State of Montana. But surprisingly, it's also a haven for a diversity of pollinating insects, especially ichneumonid wasps. This is the story of a day in the field and all of the pollinators I found on a small patch of leafy spurge.