Hello Jim, and others . I don't know this plant, but given the fact that you had problems pollinating it last year, I'd do it again this year, using new pollen on an old flower and vs.vs, to take advantage of any built-in discrepancy that would ordinarily foil self-pollination. If it doesn't work again this year, I'd try a 1% solution of 2-4D into the center of the flower as an assist (which can work with other difficult plants). Another gimmick is a .01% sol'n of boric acid, yes, that's very weak, delivered to the stigma, or one's own saliva as a moistening agent. All three methods have their adherents in the lore of hybridizers. Only one published article about 50 yrs. ago, which I can't designate for you or steer you to.