Carex obnupta Carex obnupta mature fruits. Carex obnupta growing in 1-gallon containers at a nursery near Seattle, WA. Carex obnupta rootball of plant grown in a 1-gallon container. Carex obnupta grown in a 4-inch container at the Berry Seed Bank research nursery located in Portland, Oregon. Carex obnupta with rootball for plant grown in a 4-inch container at the Berry Seed Bank research nursery located in Portland, Oregon. Carex obnupta female flowers viewed through a microscope. Carex obnupta male flowers under microscope. Carex obnupta rhizomes.