Primulaceae. 189 



E. Warming (1886, a) gives a description of the flower 

 biology, and states in this connection: "All flowers from 

 Greenland, examined by me, showed homogamy, as far as 

 could be ascertained ; in a bud, near its expansion, the 

 pollen grains were observed lying loose and fully developed 

 in the anthers still closed, and the papillae of the stigma 

 were as large as those in an older flower ; the stigma was 

 in all species level with the middle of the anthers (fig. 10, B) ; 

 self-pollination is inevitable as the corolla tube is very nar- 

 row, and the anthers lie close up to the stigma; the anthers 

 incline somewhat towards the stigma (fig. 10, B), and looking 

 into the throat from above, the stigma is found to be sur- 

 rounded by the five anthers (fig. 10, C). Cross-pollination is 

 of course not impossible, but it seems to me, that to be 

 effective, the tubes of the foreign pollen must develop more 

 quickly, than those of its own pollen. I found germinating 

 pollen grains on the stigma, while pollen yet remained in the 

 anthers". In all the flowers examined by me, I also observed, 

 that the position of the stigma, in relation to the stamens, 

 was as given in fig. 10, B. The limb of the corolla reaches 

 a diameter of 8 mm. 



As to the anatomy, this form corresponds so closely 

 with the species described earlier, that a few remarks will 

 suffice. 



Crystals of a calcium salt were also found in the exoder- 

 mis of the root of Pr. farinosa var. groenl. The sclerenchyma 

 of the peduncle is only shghtly developed in tiny speci- 

 mens such as illustrated in fig. 10, Л , but the plants may 

 develop much more vigorously, and in these the structure of 

 the peduncle is like that of Pr. egaliksensis and Pr. stricta. 

 Abromeit states, that owing to the presence of anthocyanin 

 in the epidermis, the peduncle, especially near its apex, 

 also the pedicels and calyces, may be dark blue-black in 

 colour. 



