Publication: Sp. Pl. 1: 327.
selected vouchers: WTU
Notes: A second subsp. is found in eastern Asia. FNA22: "Juncus articulatus hybridizes with J. brevicaudatus (= J. Â´ xfulvescens Fernald), J. alpinus (= J. Â´ xalpiniformis Fernald), J. nodosus, and J. canadensis.
Juncus articulatus var. obtusatus Engelmann appears to be intermediate with J. alpinus. It has spreading inflorescence branches but obtuse inner tepals. This may represent a backcross with J. alpinus. Recent evidence suggests that J. alpinus is a polyploid species with J. articulatus as one of its parents."