The concept of the mountain ranges of the southwest as sky islands goes back to at least 1943 when Natt N. Dodge wrote that...
There is a large batch of horehound (Marrubium vulgare) under a mesquite in our yard. Well, along a fence line that defines “our yard”....
I like this paragraph from The Vascular Plants of the Gila Wilderness: “Psacalium decompositum is a distinctive plant that apparently reaches its most northern...