Check out the herbarium specimen, it doesn't have the waist either (if it's correct)
http://w3.biosci.utexas.edu/pr...
Quite straight leaves here too ..
http://sbwildflowers.wordpress...
I can see a slight waist in some leaves on yours too Dave, on the younger leaves. One looks a bit more just waved, maybe they lose the waist on mature leaves or are variable, or have subspecies?
