I took these out in the garden today. This is the first time I had these two species in flower at the same time, though they are different areas. Usually P. acaule is all done flowering by the time P. yampaensis gets started. I guess this shoots down my theory about why they don't seem to intergrade.
The later is over twice the leaf size but the flowers are about the same size.
The later is over twice the leaf size but the flowers are about the same size.