| Juncus mertensianus Bong. | |
| Publ. & Syn. | Juncus supinus Moench, Enum. Pl. Hass. 1: 167 (1777). Described from Europe and North America. |
| Notes | The base chromosome number may be x = ca. 17. |
| Chromosomes | (1) 40. - Canada (British Columbia). - Taylor and Mulligan (1968, two counts). (2) 80. - Canada (British Columbia). - Hämet-Ahti and Virrankoski (1971). |
| Geography | American Pacific - Cordilleran: ALA. |
| Distribution | N = F E = R AW = r [ key ] |
| Parent taxon | Juncus L. |
| PAF ID | 320114 |