320125b Juncus arcticus subsp. intermedius Hyl.
Distribution
Northern Iceland: Frequent
Shrub Tundra: Frequent
Bordering boreal or alpine areas: Frequent
- Hyl., Bot. Not. 106: 353 (1953). Holotype (C): Iceland: Vallenes, 03. July 1893, leg. H. Jónsson.
Geography: European (NW): ICE.
Notes: Elven and Solstad: Juncus arcticus and J. balticus in their strict meanings both occur in Iceland. However, the most common plant there is one combining features from the two (but fertile and probably not a hybrid) and treated by Hylander (1953a, 1953b) as J. arcticus subsp. intermedius. Snogerup et al. (2002) and Snogerup (in comment) refuted extensive occurrence of intermediates between these two species elsewhere. The Icelandic case might either be due to local divergence, and then probably from J. arcticus, or to a break-down in the reproductive barrier between J. arcticus and J. balticus, extensive introgression, and a large-scale homogenization towards an intermediate plant.
Higher Taxa
- Juncus arcticus [320125,species]