I have wild collected Rhinanthus angustifolius or greater yellow-rattle available. Seeds are only viable for a short period so it's best to sow now. The yellow-rattle is a half parasite on grass, especially the tougher ones like Elytrigia. It is used in meadows to keep down the growth of the grass and create more space for flowers, and it is attractive in itself (at least more attractive then Elytrigia).
Anyone interested?
Sorry, it's no longer available.
Rob