Juncus stygius, called the bog rush and moor rush, is a species of flowering plant in the genus Juncus, with a high circumboreal distribution, never reaching further south than Switzerland, Korea and Upstate New York.
Subtaxa The following subspecies are currently accepted: Juncus stygius subsp. americanus (Buchenau) Hultén – Korea, Pacific coastal Russia, Alaska, Canada, United States Juncus stygius subsp. stygius – Eurasia less Korea and Pacific coastal Russia
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