Whatever you do, DO NOT order seeds from "White River Source" nursery in Richmond, Indiana. I ordered and paid for Alder, pine nut and Peashrub seeds, then when they didn't send them or return e-mails, I learned the hard way that they have a history of ripping people off. ops:
I know that he offers black Locust and Siberian Pea bush/Tree. Probably several others. I have dealt with him for years, and never any surprises! They are in their 100th year, and the present Owner/Operator has been there about 40 years.
His prices are quite reasonable. Order 1 or 2 packets from him and he will send you a catalog (all seeds listed by their Latin names). with your order. The catalog is a great reference book on plants.