Panarctic Flora


741001 Arctostaphylos uva-ursi (L.) Spreng.


Northern Iceland: Scattered
Northern Fennoscandia: Rare
Kanin - Pechora: Scattered
Polar Ural - Novaya Zemlya: Rare
Yamal - Gydan: Rare
Northern Alaska - Yukon: Scattered
Central Canada: Rare
Hudson Bay - Labrador: Rare
Western Greenland: Rare
Southern Arcti Tundra: Rare
Shrub Tundra: Scattered
Bordering boreal or alpine areas: Frequent

2n= (1) 26 (2x). - Canada, U.S.A. - Numerous reports, mostly for "adenotricha", partly for "coactilis" and "longifoliosa".
(2) 39 (3x). - North America. - At least three reports for "coactilis".
(3) 52 (4x). - Europe, Russia, Canada, U.S.A., Greenland. - Numerous reports, mostly for "uva-ursi" but many American ones for "coactilis", one for "adenotricha".
(4) 65 (5x). - North America. - Packer and Denford (1974); Rosatti (1987). Both for "uva-ursi".
(5) 78 (6x). - North America. - Rosatti (1987, for "coactilis").
Not included: An old report of 2n = 72 (Tischler 1934).

Geography: Circumboreal: ICE NOR RUS SIB ALA CAN GRL.

Notes: Five ploidy levels (2x-6x) are reported from Arctostaphylos uva-ursi. Tetraploids occur throughout, whereas all levels from 2x to 6x are reported from North America. Also the morphological variation is obviously larger in North America than elsewhere. A fairly intricate specific or infraspecific taxonomy has been proposed (Fernald and Macbride 1914; Calder and Taylor 1965; Packer 1967; Löve et al. 1971; Packer and Denford 1974; Rosatti 1987; Wells 1988), mainly based on the ploidy variation and differences in pubescence: glandular vs. non-glandular. Wells (1988) found the pubescence variation to be mainly intrapopulational. He could not confirm the ploidy differences between named races as stated by Löve and Löve (1975a). No investigation has been made outside North America, and the most current study (Wells 1988) resulted in a reduction of the described races to forms. Waiting for combined cytological and molecular investigations, we accept no infraspecific taxa. Neither did Parker et al. (2009). There may be some intricate structure of several low-ploidy lineages combining at the higher ploidy levels.

Higher Taxa