I come from Nebraska, and yes I think that wild marijuana accounts for a good tenth of ditch vegetation. I remember making hash out of it as a junior in high school. Let me tell you, theres nothing in that weed for you but headaches and sore lungs. It's always been my intention, though, to go buy three strains from gypsy nirvana (that would come to a total of $50) and take soil from a naturally occurring hemp patch, then grow plants indoors using a mix of half natural soil and half real growing medium! The plants that did the best would be transplanted outdoors with the hemp.

Mexicans have agriculture down to a t -- they plant their domesticated corn fields adjacent to wild corn, because they know that the cross pollination will end up creating a strain that is resistant to local weather conditions, pests, and diseases.

Anyway, I would strongly encourage you and everyone else to do their best to introduce good medicinal genetics into this vast pool of hemp genetics.

P.S.
I think that the thousands and thousands of hemp plants you see all over Nebraska are remnants of hemp cultivation from WWII.