Puncturevine or what I call Biker's Bane , summer Eagle Valley (Tribulus terrestris,
member of the Zygophyllaceae or Caltrop family)
Prostrate terrorist of invasive weeds, Biker's Bane produces a prodigious number
of spiny burs that can easily penetrate even mountain bike tires protected
with double layers of kevlar. If you are on a dry, sandy, unpaved road, between
300 to 3000 feet of elevation, it is best to know that you are squarely in
the domain of Tribulus horibulus, and a flat is only a single, tiny puncturevine
bur away.
On the road in the American Northwest.
