52 B 



Canadian Arctic Expedition, 1913-18 



Figure N. 



Androaace Chamaejasme Host.; a flowering specimen, showing the primary root and th* 

 stolons above ground terminated by rosettes of leaves and mflorescences; natural size; specimen 

 rom Bernard harbour. 



group of sessile rosettes. The rosette dies off after the first flowering, becoming 

 replaced by the secondary rosettes. The root-system is thus poorly represented 

 and secondary roots are very scarce; when such develop, they proceed, one or 

 two together, from the nodi of the stolons. There are thus apparently two types 

 of shoots in this plant, viz. : the stolons with stretched internodes, and the axis 

 of the rosette, consisting of extremely short internodes with crowded leaves. 

 However, as a matter of fact, it is the same shoot, an axis of the same order, 

 which thus becomes modified in structure according to its function, to develop 

 in the manner of a horizontally creeping stolon, with the uppermost internodes 

 becoming shortened so as to produce a rosette with a terminal inflorescence. 



Primula borealis Duby. 



Kjellman,! who has offered so many and most excellent contributions to 

 the knowledge of the life-history of arctic plants, describes the over-wintering 

 buds of Primula nivalis. 



In this species the over-wintering bud consists of several fleshy, scale-like 

 leaves surrounding a series of very small leaves which in the following season 

 will develop into green assimilating leaves; in the centre of the bud an inflores- 

 cence is already formed, and this structure is to be observed at the commence- 

 ment of the winter. The material of P. borealis Duby collected on the expedition 

 contains numerous specimens with an old withered scape from the year previous 



' tJr Polarvaxternas lif. Stockholm, 1884. 



