In the United States, "Prosopis" has become the dominant woody plant on of semiarid grasslands. North America is its native range and due to an imbalance within this ecosystem has been able to spread rapidly. It is considered the most common and widely spread "pest" plant in Texas. An estimated 25% of Texas’ grasslands are infested and 16 million acres are so invaded that it is suppressing the majority of grass production. In Mexico and the US, the two most problematic species are honey mesquite ("Prosopis glandulosa") and velvet mesquite ("Prosopis velutina)."