378 С. H. Ostenfeld. 



ring just beginning. 11/vii and 20/vii: In full flower and with year-old 

 scapes. 3/viii: The petals have dropped; empty year-old capsules. 



Fam. Polygonaceæ. 



27. Oxyria digyna (L.) Hill. 



11/vii: Medium sized (12 cm) specimens with unripe new fruits 

 and year-old fruiting scapes. 3/viii : Low specimens (4 cm) with unripe 

 fruits. 



28. Polygonum vivipanim L. 



11/vii: Medium sized specimen; most of the bulbils dropped. The 

 underside of the leaves rather hairy. 



Fam. Ranunculaceæ. 



29. Ranunculus sulphureus Soland. 



11/vii: Small specimens (ca. 5 cm) in full flower. 3/viii: Flowering 

 over and fruits developing, 



Fam. Rosaceæ. 



30. Dryas integrifolia M. Vahl. 

 18/v: Winter stage. 



The specimens from Zigzagdalen are quite typical D. integrifolia 

 with regard to the dentation of the leaves etc. 



The two nearly related species, D. octopetala and D. integrifolia, 

 which mostly exclude each other as regards their areas of occurrence, 

 are both present in the northernmost parts of Greenland, and inter- 

 mediate specimens occur here. Hence we have the diverging records, 

 some authors giving D. octopetala, others D. integrifolia from the same 

 or closely neighbouring regions. Thus H. G. Simmons (1909, 1. c.) 

 has referred all records of Dryas from Northwestern Greenland to 

 D. integrifolia, taking var. intermedia Nath. as a form of this species. 

 In North-eastern Greenland on the other hand D. octopetala is the 

 commoner species and D. integrifolia the rarer one. Kruuse (Medd. 

 om Grønland, XXX, 1905, p. 148) reports D. octopetala (in several 

 forms) from his whole area and D. integrifolia (which he regards as 

 a subspecies) only from a few places — all situated in the inner 

 parts of the fjords. Ostenfeld and Lundager (Danmarks Eks- 

 peditionen, Medd. om Grønland, XLIII, 1910, p. 28) also give D. octo- 

 petala as the common species in Germania Land and the other localities 

 investigated which all are near or comparatively near to the coast; 

 only the specimens from Hyde Fjord belong to var. intermedia Nath., 

 and on closer examination now I should prefer to put them under B. 

 integrifolia. 



Thus it seems that the true D. integrifolia in the northernmost 

 part of Greenland is rather rare and restricted mostly to the heads of 

 the fjords. 



