1902] Holm On the Genus Arctophila, Rupr. 79 



two. The empty glumes are relatively longer and more acute in 

 A. fulva (Fig-. 2.) than in A. pendulina (Fig. i.) and A. ej^usa (Fig. 

 3,); the flowering glume is also narrower and longer in A. Julva. 

 We might state, moreover, that the base ot the spikelets seems 

 to afford an additional character by being more or less acute in A. 

 fulva and A. pendulina, but obtuse in A. effusu, during the 

 anthesis ; this character follows the relative number of flowers in 

 the spikelet, thus where more than three or four flowers are deve- 

 loped, the spikelets are generally acute at base, but obtuse, 

 where a smaller number is present as for instance in A. effusa. 

 The panicle of A. effusa is erect with the capillary rays deflexed, 

 while the whole ii. florescence is nodding in the two other species. 

 In regard to the geographical distribution of these species, 

 A. fulva has been reported from a number of places in arctic Russia 

 and Siberia, but the only specimens which we have seen from 

 North America were collected at Muckelung River in British 

 Columbia and on the west coast of Hudson Bay, Lat. 56. ; the 

 specimens from the former locality were by Beal, referred to A. 

 pendulina, but they do not agree with this species, of which we 

 have studied typical material from arctic Europe. 



A. fulva occurs in Lapland under two forms : maxima and 

 m.intfna, as recorded by Brotherus, but in accordance with Nylander 

 none ot these are referable to the type, but represent his var. 

 Lapponica : " panicula laxa ramis undique sparsis, pendulis, 

 flexuosis, spiculis 2-5 floris versicoloribus, valvulis basi pilorum 

 fasciculo barbati." 



In regard to A. pendulina no definite geographical range can 

 be given at present since Grisebach included A, eff'usa in this 

 species, and since Kjellman in reporting A. effusa from the Sibe- 

 rian coast refers to both Lange's A. effusa and Grisebach's Col- 

 podium pendulinum as synonyms ; we only know for certain that 

 it occurs in arctic Europe in the places recorded by Hartman and 

 Hjelt, while we have not, so fir, seen any specimens from this 

 continent. 



The third species A. effusa is known from the west coast of 

 Greenland, Spitsbergen and Arctic Siberia ; the plant from Spitz- 

 bergen formerly considered as a distinct species : Colpodium 



