S. are currently pursuing such interspecific (between species) and intergeneric (between genera) hybrids to develop perennial wheat, sorghum, corn, flax and oilseed sunflower.

• 在美国各地，许多育种计画也正进行异种杂交异属杂交，以发展多年生小麦、高粱、玉米、亚麻和油用向日葵。