354 



Morten P. Porsild. 



leaf (Fig. 5 B^ b, 4 C), this was especially prominent in the case 

 of T. coccinea. During calm weather the cavity of the peri- 

 gonial leaf is filled with pollen. When the flower has been open 

 for some time the filaments, as well as the perigonial leaves, 

 start curving upwards, and then the introrse anthera cannot 

 avoid touching the stigmas. Thus cross-pollination is possible, 

 but self-pollination the rule. 



Zmm 



Fig. 7. T.palustris (Disko, Greenland). 



A. Hibernated inflorescence with upwards-directed capsules, cha- 

 racteristic ot the species. 



B. Single, complets fruit of the same. 



C. Almost ripe inflorescence gathered late in autumn. 



D. Fruit, almost ripe, but not yetopen. (Theperigonialleavesremoved). 

 Note the almost perfect symmetry, as against T. coccinea. 



E. Hibernated capsule with walls partly fallen off. typical for the 

 species. Some seeds are still seated on the placentas. 



F and G. A "normally" opened fruit (a rare case in the species), /''.in 



moist condition. G. dry, seen from above. 

 H. Seeds. (Drawn by T. P.) 



A ft er the polli nation the inflorescence, which hitherto 

 has been slightly nodding, straightens itself up, and the 



