641033 Potentilla gorodkovii Jurtz.
Distribution
Anabar - Onenyo: Rare
Kharaulakh: Scattered
West Chukotka: Frequent
Wrangel Island: Frequent
East Chukotka: Frequent
Mid Arctic Tundra: Scattered
Southern Arcti Tundra: Frequent
Shrub Tundra: Frequent
Bordering boreal or alpine areas: Frequent
- Jurtz., Fl. Arct. URSS 9, 1: 319, 190 (1984). Holotype (LE): Russian Far East: Wrangel Island, "in curso medio fl. Gusinaja, ad rivulum Leningradskij", 21. July 1970, leg. P.G. Zhukova and V.V. Petrovsky 70-161.
2n=
(1) 28 (4x). - Far East (Wrangel Island). - Zhukova and Petrovsky (1985b, two counts, one on type specimen).
(2) 42 (6x). - Far East (Wrangel Island). - Zhukova and Petrovsky (1985b, one count).
(3) 49 (7x). - Far East (Wrangel Island). - Zhukova and Petrovsky (1985b, two counts).
(4) 56 (8x). - Far East (Wrangel Island). - Zhukova and Petrovsky (1985b, five counts).
Geography: Asian (N) - Asian Beringian: SIB RFE.
Notes: Yurtsev: Potentilla gorodkovii has the general appearance of P. uniflora, including the peculiar, somewhat flabelliform shape and strong dissection of leaflets and both stipules and epicalyx segments lanceolate, but differs from it by pubescence of petioles in at least a part of the leaves white tomentose and sparsely patent-pilose, with slightly more numerous but shorter teeth on the leaflets (3-4 on each side). Stipules are lanceolate, somewhat laxly tomentose. This is a common plant of the eastern Siberian and Chukotkan Arctic, grows in dry rubble tundra, sometimes without one of the presumed parents (rarely of both), sometimes more frequent than parents. In general, chromosome data testify to the secondary origin of P. gorodkovii and for participation of agamic reproduction.
Yurtsev, Elven, and Murray: Potentilla gorodkovii is assumed developed from cross(es) between P. nivea and P. uniflora and is Asian (as is P. uniflora). However, northern Yakutian material rather indicates that what there is named as P. gorodkovii results from cross(es) between P. crebridens subsp. hemicryophila and P. uniflora. Further investigations may prove that Asian P. gorodkovii as currently considered is heterogeneous (see also ploidy levels) and consists of at least two hybrid species, one involving as parent the tetraploid P. crebridens and one the more high-ploid P. nivea, as we also assume for the mainly American counterpart of P. subgorodkovii.
Higher Taxa
- Potentilla [6410,genus]