Amarillo is only grown on Virgil Gamache farms. They 'own' Amarillo. Hence the trademark on the name.
edit - so all Amarillo this year will probably be the same.
Not entirely accurate. There are two Czech Budweiser breweries. A-B InBev bought the smaller one. The non-Czechvar/Budvar one, but it still imports the non-Czechvar/Budvar one.