question: What types of trees grow near rivers in western Oklahoma ?
answer: pinyon pines , red cedar ( junipers ) , and ponderosa pines
turker_answer: Pinyon pines , red cedar ( junipers ) , and ponderosa pines are trees that grow near rivers in western Oklahoma .
rule-based: Pinyon pines , red cedar ( junipers ) , and ponderosa pines grow near rivers in western Oklahoma .