287 



Notes on Arctic Plants. 



By 



O. Gelert. 



I. 



Eatrema arenicola Richardson. 



This plant is described and figured in Sir William 

 Hooker's: Flora Boreali-Americana I, p. 67, tab. 24 (1833). 

 Although the plant wanted one of the most essential charac- 

 ters for the genus Eutrerna, the incomplete dissepimentum, 

 the author did not hesitate to put the plant there because 

 of the general likeness to Eutrerna Edwardsii R. Br. But 

 the likeness is by no means close. Eutrerna Edwardsii. has 

 a very thick unbranched taproot and a shortbranched caudex 

 out of which only rise a few stems, which in the lower part 

 carry a few longstalked leaves. The leaves of the stem 

 decrease by little and little in length and breadth, so that 

 the upper leaves are small linear and sessile. The pods are 

 lance-oblong narrowed gradually to both ends. On the other- 

 hand the figure of Eutrerna arenicola shows a smaller 

 and branched root with a very branched caudex and 

 numerous stems with very numerous radical longstalked 

 leaves, on the stems only a few, which are nearly sessile, 

 spathulate-oblong, the upper ones not conspicuously smaller 

 than the lover ones. The pods have parallel margins and 

 are obtuse at both ends. Afterwards Sir Joseph Hooker 

 in his Outlines of the distribution of Arctic plants 1860 (p. 315) 



