| Juncus gerardii Loisel. | |
| Publ. & Syn. | Loisel., J. Bot. (Desvaux) 2: 284 (1809). Described from Provence (France). Lectotype not designated (Kirschner et al. 2002c). |
| Notes | Juncus gerardii is probably functionally tetraploid. We accept two subspecies - subsp. gerardii and subsp. atrofuscus - as major and largely allopatric geographical races. The morphological differences are clear (e.g., Snogerup 1980; Kirschner et al. 2002c; Elven et al. 2005) but transitional forms occur in their narrow meeting zone in northern Norway. |
| Chromosomes | 106-108 100-ca. 120. - Europe, Russia, Canada, U.S.A. - Numerous reports. Löve and Löve (1975a) accepted three reports of 2n = 106, one from an arctic locality, and omitted the numerous other reports (including their own) within the wider range reported above. |
| Geography | Amphi-Atlantic - European - Asian (W). |
| Parent taxon | Juncus L. |
| Child taxa |
Juncus gerardii subsp. atrofuscus (Rupr.) Printz Juncus gerardii subsp. gerardii |
| PAF ID | 320118 |