23 



are unable to perform their functions for more tlian two, or at 

 the most three, years. In exposed, dry situations the older 

 leaves often become quite colourless. 



The flowers occur singly at the apex of the branches, and 

 are drooping (Fig. 13). The leaves at the base of the peduncles 

 are shorter and broader, and more scale-like than the usual 

 foliage-leaves (Fig. 14 F]. The flowers are formed in the bud 

 during the year previous to that in which they expand (Fig. 14 B). 

 The calyx and peduncle are deep-red in colour. 



The bell-shaped corolla is white with purple teeth and is 

 widely expanded, hence no hairs 

 occur upon its interior (Fig. 1.5). 



Above their slender bases the 

 filaments become very thick (being 

 broader than those in С tetragona), 

 and are covered with small pointed 

 warts (Fig. 15 Z''); they stand close 

 to the ovary, with Iheir long, hairy 

 appendages directed straight out- 

 wards (Fig. 15 A. B). The pores 

 are elongated (Fig. 15 Æ", i^); at 

 first they turn downwards, after- 

 wards upwards (consequently in 

 the drooping flower downwards). 

 LiNDMAN points out that the appendages must be shaken before 

 the pollen (Fig. 14 C) can be shed. 



The style is conical and very thick at the base (Fig. 15 C). 

 The carpels are antipetalous, and the flower is obdiploste- 

 monous. 



in the material from Greenland the apex of the style is 

 evenly rounded off so that the stigma is not very prominent 

 (Fig. 14 E; Fig. 15, A, C). Lindman and Ekstam found the latter 

 to be more distinct, occurring as a flat, somewhat rough disk. 



The flower is homogamous or perhaps protandrous for a 



Fig. 13. Cassiope hypnoides. 



Part uf a plant: ='1. (E. W., 18Hj). 



