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Juncus ensifolius juen php. en Juncus ensifolius capsules nl Zwaardrus doosvruchten usda gov USDANRCS PLANTS Database Hurd Goodrich and Shaw Field guide to Intermountain rushes General Technical Report INT USDA Forest Service RMRS Ogden USDA NRCS The PLANTS Database usda gov August National Plant Data Team Greensboro NC