Viper's Bugloss

This spectacular non-native but common Ozark wildflower also called Blueweed (Echium vulgare) is typically found in "disturbed ground" and gravel bars. On a Huzzah River gravel bar almost a whole field of these grew three feet tall, their flowers inhabited by bees and butterflies. It looked like a city of apartment buildings with tenants flying from room to room. The seed supposedly looks like a viper's head. (A simile is like a metaphor.) Handling this plant might give you a rash.