slgwv's photos with the keyword: weed

Cirsium arvense . Turns out the common name is a canard. It's in fact an Old World invader weed, which is now well established thruout much of North America. You often find it along trails--why trail horses are supposed to have "weed-free" hay! The seeds are commonly introduced in horse droppings. Toiyabe Range, Nevada, USA.