Test your knowledge of the Pacific Northwest's most notorious flora, intermixed in this quiz with photos of their harmless lookalikes. Can you tell them apart? Let's find out now, before you learn the ...

The N.C. State Cooperative Extension Service recently updated its online Poisonous Plants database to include a whopping 624 different entries — occupying every category of plants, from trees and ...

Forbes contributors publish independent expert analyses and insights. I write about biodiversity and the hidden quirks of the natural world. Poison is a well-known defense mechanism in the animal ...