BOISE, Idaho -

A third Mexican national has pleaded guilty to growing thousands of marijuana plants on public lands in Idaho.

The U.S. attorney's office says 40-year-old Carlos Cerda-Carpio pleaded guilty Monday to a federal charge of unlawfully manufacturing more than 1,000 marijuana plants with intent to distribute and illegal possession of a firearm. A co-defendant, 22-year-old Mariah Villasenor-Rodriguez of Caldwell, pleaded guilty to possession of marijuana with intent to distribute.

Prosecutors say the charges come out of a September 2013 raids on outdoor marijuana growing operations in the Boise National Forest in Boise County that netted over 6,800 marijuana plants, harvested marijuana and guns.

Two other men pleaded guilty earlier this month. All four defendants face sentencing in May.

Trial for a fifth co-defendant, Juan Pablo- Villasenor-Villa, is scheduled for July 21.