500727a Saxifraga rivularis subsp. rivularis
Distribution
Northern Iceland: Frequent
Northern Fennoscandia: Frequent
Kanin - Pechora: Scattered
Svalbard - Franz Joseph Land: Frequent
Polar Ural - Novaya Zemlya: Scattered
Yamal - Gydan: Rare
Hudson Bay - Labrador: Rare
Ellesmere Island: Rare
Western Greenland: Frequent
Eastern Greenland: Frequent
Polar desert: Rare
Northern arctic Tundra: Frequent
Mid Arctic Tundra: Frequent
Southern Arcti Tundra: Frequent
Shrub Tundra: Frequent
Bordering boreal or alpine areas: Frequent
2n=
43-95 52 (4x). - Europe (N), Canada (E), Greenland. - Numerous reports, e.g., Guldahl et al. (2005, Svalbard nine counts of 2n = 26?, 43, 47, 50-52, 52, 85, and 95, often endopolyploidy, otherwise aneuploidy). Tetraploid in FCM, Jørgensen et al. (2006, southern and central Norway, Svalbard, Greenland, Jan Mayen, Iceland, 37 plants from 19 populations); Guldahl et al. (2005, Iceland, eastern Greenland, six plants).
Not included: A report of 2n = 52 (4x) from the Rocky Mountains (Löve et al. 1971) is enigmatic as this is the area of the diploid S. flexuosa only (or of diploid S. debilis). In absence of voucher the matter cannot be resolved.
Geography: Amphi-Atlantic - European (N) - Asian (NW): ICE NOR RUS SIB CAN GRL.
Notes: Zhmylev: Saxifraga rivularis s. str. is an amphi-Atlantic species. At present, only plants with runners and 2n = ca. 52 are attributed to S. rivularis s. str.
Jørgensen and Elven: Subspecies rivularis is separable from subsp. arctolitoralis in hypanthium sparsely covered by short glandular hairs (up to 0.2 mm) with colourless or weakly coloured partition walls vs. densely covered by longer glandular hairs (0.3-0.6 mm) with purple partition walls; the whole plant green or with some colour in the inflorescence vs. distinctly coloured at least in the inflorescence; and flowering stems mostly long (2-7 cm) and glabrous or sparsely hairy vs. short (1.5-3 cm) and sparsely to densely hairy (Jørgensen et al. 2006).
Higher Taxa
- Saxifraga rivularis [500727,species]