Field Scabious

Field Scabious (Knautia arvensis)
I've found nothing about this plant in any of my toxin books. I did find this in Biomat.net, a European project to "Realize the Economic Potential of Sustainable Resources - Bioproducts from Non-Food Crops: "It is now regarded as a potential oilseed crop: the seeds contain about 25 percent oil, of which some 33-40 percent is in the form of the saturated caprylic and capric acids. These acids are being increasingly used in high-performance oils for jet engines and
other lubricants of high quality, and also in the preparation of some valued dietary fats. At present, the only directly available sources of these acids are coconut and palm kernel oil, which are imported principally for their content of lauric acid, used in soap and detergent manufacture. A locally grown source of these acids would be welcomed by the oleochemical industry; preliminary agronomic studies have been undertaken at Sonning during recent years."
My one caution would be about timing of grazing. I found a fact sheet from Alberta that said that wildlife and cattle nip the flowers off which could facilitate seed spread and another piece that said that seeds were viable almost as soon as the flower blooms. If that's true, I'd want to graze it early.