Plants collected during the First Thule Expedition. 379 



31. Dryas octopetala L., f. minor Hook. 



23/v: Winter stage. 20/vi: in full flower. 3/vin: in beginning 

 fruit -setting. 



The specimens from 23/v are good D. octopetala -f. minor \ those 

 from 20/vi are a mixture: 1) some are good D. octopetala with regard 

 to dentation of the leaves, but hairy on the upper side of the leaves 

 (f. hirsuta N. Hartz) or lanate on the upper side (f. argentea A. Blytt), 

 2) others are intermediate between D. octopetala and D. inlegrifolia and 

 must be referred to var. intermedia Nath. The specimens from 3/vin 

 agree with the last mentioned and must also be named var. intermedia. 

 It is remarkable that in the area where D. octopetala and D. integrifolia 

 both occur, the variability of the species is much greater than elsewhere 

 and that this variability concerns not only the distinctive marks 

 between the two species, but also other characters, e. g. hairiness. 



32. Potentilla emarginata Pursh. 



18/vi: Winter-stage with old leaves and flower stalks; new leaves 

 only as small buds (locality correct?). 20/vi and 11/vii: Low speci- 

 mens in flower and with year-old flower stalks. 



33. Potentilla nivea L. 



18/v: W T inter-stage ; condensed specimens with old leaves and flower 

 stalks; also as "pillars". 20/vi: Flowering just begun, old flower stalks 

 present; also as "pillars". 3/vin: Fruiting specimens. 



The specimens from 18/v and 20/vi belong to var. pimiatifida Lehm., 

 while those from 3/vin are more like the typical P. nivea. In the first 

 two collecting places wind-affected specimens forming compact "pillars" 

 (with a few living leaves in the top of the erect standing axis covered 

 densely with dead leaves) were found, like those mentioned and figured 

 by Ostenfeld and Lundager (1. c. p. 27 and plate V). The "pillars" 

 collected during the Danmark Ekspedition were referred to P. pul- 

 chella R. Br., but on repeated examination I have found that some 

 of them belong to P. nivea, as also those here mentioned. 



34. Potentilla pulchella R. Br. 



18/vi: A medium sized specimen with large year-old leaves and 

 new leaves in buds. 3/vin: A low specimen (f. humilis Lge.) with rip- 

 fruits. 



Fam. Salicaceæ. 



35. Salix arctica Pall. 



18/v and 23/v: Branches in winter-stage and with empty year- 

 old capsules. 3/vi: Branches, dropping the scales covering the catkins. 

 20/vi: Female specimens with flowering catkins and half developed 

 leaves. 3/vin: Leaves fully developed, broadly ovate in some speci- 

 mens, ovate-lanceolate (f. groenlandica Lundstr.) in others. 

 LI - 27 



