20 H. G. SIMMONS. [sec. arct. exp. fram 



The species of vascular plants hitherto 

 found in JEllesmereland. 



Compositae. 



Taraxacum hyparcticum, Dahlst. 



T. hyparcticiim, Dahlstedt, Stud. arkt. Tarax., 1905; T. phijniatocarpum, Simmons, 

 Prel. Rep. et Bot. Arb., ex p., non Vahl; T. Dens-Leonis, Hart, Bot. Br. Pol. 

 Exp., ex p.; T. officinale var. pallida, Greely, Rep., ex p.; Leontoclon palustre, 

 Hooker, FI. Bor. Amer. (?). 



Fig. Dahlstedt, I. c. ; Tab. nostra 1, fig. 1. 



At first I thought all my Taraxaca to be referable to T. phyma- 

 tocarpum, Vahl, which therefore was quoted in my Prel. Rep., but 

 afterwards I found that I had two species from Ellesmereland besides 

 one other from N. W. Greenland. In the mean time, however, Mr. H. Dahl- 

 stedt, Assistant at the State Museum in Stockholm, the well-known 

 ^ieraciwm-specialist, had begun a comparative study of the arctic forms 

 of Taraxacum, and as he wished to see my collection, it was sub- 

 mitted to his inspection, with the result, that he arrived at the 

 conclusion, that most part of the collection from Ellesmereland was 

 to' be referred to an allied new species, T. liyparcUcum, whereas 

 the true T. phyniatocarpuin was only represented by a single individual. 

 Besides he found still another new species. The two latter I had thought 

 to belong to the real T. phymatocarpiim. As Dahlstedt, I. c, has given >^ 

 a detailed diaguosis of the different species, it may be enough here to 

 refer to his paper. The above list of synonyms could perhaps be increased 

 by some more references, but, as the statements in literature are always 

 referalde to several species at a time, I have refrained from doing so. ^ 



T. hypardicum is mostly found in rock-ledges and slopes with a 

 rich, densely vegetation-clad soil, sometimes also in the clay-plains of 

 valley bottoms. It begins to show its flowers at the end of June or 

 beginning of July, and soon is to be found with fruit in abundance. 



Occurrence. Grinnell Land, Discovery Harbour (specimens of 

 Hart and Feilden in the Nat. Hist. Museum !). East Coast: Hayes Sound, 

 mouth of Flagler Fjoi-d, Beitstad Fjord, Skriiling Island in Alexandra 



) 



