The Flora of Disko Island and Adjacent Coast of West Greenland. 101 



to P. emarginata. Other records exist from Godhavn (Mar- 

 grete Smith) and Christianshaab (V.), and we can add 

 Umånaq (Lundager) and Jakobshavn (A.P.Olsen). The 

 flowers of the last mentioned specimen are glomerate, 

 but the flowering is in its very beginning. The specimens 

 of Lundager have pedunculate flowers, but the ribs are 

 not purplish. 



4. var. pinnatifida Lehm., Th. Wolf, emend. (Syn. P. 

 quinquefolia Rydb. Mern. Dep. Bot. Columb. Univ. 1898. 

 P. siibquinata Rydb. Bull. Torr. Bot. Cl. 28 p. p. 181, 

 1901 P. fiivea e subqiiinata Lange, Consp. FL Groenl. 

 p. 9, 1880. 



The common form in our area. Exceedingly 

 varying according to the conditions of the habitat. As a 

 dwarf form from dry rocks with scanty snow covering 

 during winter, we consider: 



5. var. uniflora (Ledeb.) Th. W. (Syn. |3 arctica Cham. & 

 ScHL., Lange 1. c. P. subqiiinata var. Pedersenii Rydb. 

 Bull. Torr. Bot. Cl. 28, p. 182 and probably var. arenosa 

 TuRi.z., Lange 1. c. p. 236 = P. riivea altaica, Bunge, 

 Rydb., 1. c. p. 181.) The range of this formis in our area, 

 identical with that of 4, with which it is connected through 

 numerous transitions. The most extreme forms are densely 

 tomentous and with few flowered stems, recalling the 

 aspect of P. Vahliana. In faet Th. Wolf placed the var. 

 Pedersenii as a synonym under P. Vahliana^ although 

 the pubescense is pure white and not yellowish, the flow- 

 ers smaller etc. 



Summarizing the above remarks there are — in our opinion — 

 only two unities of a higher order in our area, viz. a common: P. nivea 

 pinnatifida and a rare: P. nivea vulgaris. Whether they are indepen- 

 dent, hereditary constant species or subspecies or only varieties of 

 the same species we cannot at present say. The decision must be left 

 till future observations and cultivating experiments have settled the 

 point. 



V 199. Potentilla Vahliana Lehm. 



On dry sand and gravel, rarer in stony soil. 



Disko: Very common, especially on the north-land, but also in alpine stations 

 or on barren basalt-gravel on the south coast to 69°15' (P.). 



Hare (Taylor; P.). 



Mainland: The basalt- and sandstone-domaines of Nugssuaq, common; 

 south of Torssukåtak at Ritenbenk (V.; Bg.) ca. 69°45' and quite isolated on the 

 Præstefjæld at Holsteinsborg 66°55' (W. & H.). 



