n genus of North and South American perennial herbs or shrubs with yellow flowers; in some classifications include species placed in other genera especially Hazardia
n dark green erect herb of northwestern United States and southwestern Canada having stiff leaves in dense tufts and yellow flower heads; sometimes placed in genus Haplopappus
n (genetics) a combination of alleles (for different genes) that are located closely together on the same chromosome and that tend to be inherited together