424 Fr. J. Mathiesen. 



and two lateral shoots (floral), D with a floral lateral shoot and four 

 reserve-buds. E, One of the leaves of a floral shoot. [A and E, Green- 

 land.) A and В about nat. size; С and D about */з; E about ^Z^. [B, С 

 and D are drawn from sketches by E. Warming.) 



floral shoots; as shown in the figures, they bear scale-leaves 

 {ex parte bud-scales) at their base; these pass gradually into 

 foliage-leaves in the middle of the shoot. The foliage-leaves 

 of the floral axes differ somewhat in form from the rosette- 

 leaves; the midrib is broader, and the incisions of the margin 

 are less deep (Fig. 20, E). The inflorescence is a crowded, 

 almost capitulate raceme, without a terminal flower; accord- 

 ing to Warming, the flowers in the middle of the inflores- 

 cence, are the first to expand. The terminal bud of the run- 

 ner, as a rule, continues its growth by forming a second leaf- 

 rosette; exceptionally, it may produce a floral shoot, which 

 consequently becomes terminal; the latter has only scale- 

 leaves at its base. In addition I must remark, that in a 

 single case, I found a runner which, without a previous 

 vegetative-stage (leaf-rosette), terminated directly in an in- 

 florescence. 



A runner hardly ever forms leaf-rosettes for more than 

 3 successive growth-periods. Also in the axils of the scale- 

 leaves of the floral shoots buds occur; in cases in which these 

 develop further, they frequently form, in the following year, 

 shoots of similar structure to the parent-shoot. Warming 

 mentions that at the base of the floral shoots also, rosettes 

 of foliage-leaves may be produced; in some cases I suc- 

 ceeded in demonstrating such leaf-rosettes, but they are 

 evidently of rare occurrence. 



The structure and biology of the flower are explained 

 by LiNDMAN and E. Warming, of whose descriptions the 

 following is an extract : The low^er lip of the almost horizont- 

 ally projecting flower incline very decidedly to the right 



