280 Morten P. Porsild. 



vaceo-fuscae. Pappi radii 40 — 50 /i crassi, usque ad basin denticulatiy 

 denticuli basales squarrosi, versus apicem magis magisque arrecto-patentes. 

 Apogama, progenies hereditarie constans. 



Ab A. alpinae variationibus omnibus habita, tomento, calathiis minutis, 

 involucri squamis obtusis, integerrimis vel levissime crenulatis, pappi radiis 

 subtenuioribus, denique distributione geographica et florendi tempore autum- 

 nali satis diver sa. 



This plant has so far only been found a few times. Specimens from 

 the following places are preserved in the Botanical Museum at Copen- 

 hagen: Sarqaq, 70°, leg. Vahl (the type); Præstefjeldet near Holstens- 

 borg, 66°55', by Th. Holm; Tupersuatsiaq, 64°44', leg. S. Hansen; and 

 Neriap Qingua, 61°45', leg. N. Hartz. It has been found several times 

 since by G. Kleist, J. Nygaard and myself on South-Disko near God- 

 havn, 69°15', and my son Thorbjørn Porsild in particular has found 

 it in different places in this neighbourhood, also at Ataneqerdluk on the 

 peninsula Nugsuaq, 70°5'. Of the localities where it is found on Disko,. 

 I know best the one (Østerli) near the Arctic Station; it grows on 

 a luxuriant slope facing the S/W, a place characterised by its richness 

 in southerly species ; here it most frequently forms large colonies, domin- 

 ating all other vegetation for more than several square metres, and one 

 of the largest colonies is so conspicuous at a certain period of summer, 

 that it can be seen from the Station, a distance of about 175 metres. 



When, in the short diagnosis concerning the specimens from Sarqaq,. 

 Rosenvinge says "stylo saepe corolla breviore'^ and later (1. c.) doubts, 

 whether the specimens from Holstensborg, considered by Holm to be 

 male plants, did actually develop fruits, it is due to the fact, that this 

 species flowers extraordinarily late as compared with the other species 

 of Antennaria in Greenland. While at Østerli the fruits of A. alpina 

 and A. glabrata can be seen ready for dispersal as early as July, those 

 of A. intermedia growing in the same position do not ripen till August, 

 more often still later, and in unfavourable seasons perhaps not at all. 

 This shows, that the species here is near its northern boundary, and the 

 fact, that on Disko it grows in the localities which are most favoured 

 and richest in southerly types, also indicates this. When the flower is 

 in full bloom, the style is longer than the corolla as in other species. 



The colonies of A. intermedia, known by me, plainly show, that 

 they have come from one and the same origin, and have spread by the 

 prevailing winds and the flow of water. Therefore I do not doubt, that 

 the species is constant to heredity, but I cannot as yet distinguish with 

 certainty the young seedlings from those of A. alpina, and my cultures 

 have so far been unsuccessful on account of my having collected the 

 fruits too early. 



