365 



two leaves of the shoot which are probably transversely-placed. 

 Usually only the main axis flowers, but the stem-leaves may 

 subtend floral axes ; these axes bear from one to two green 

 bracts. The stalked 



stem-leaf probably 

 rarely subtends flowers, 

 but upon vigorous spe- 

 cimens a shoot is fairly 

 frequently developed 

 in this axil, which how- 

 ever can scarcely pro- 

 duce more than two 



transversely - placed, 

 stalked foliage-leaves. 

 The principal bud 

 is situated in the 

 uppermost leaf-axil at 

 the base of the stem 

 (Fig. 17 1; frequently 

 the leaf below also 

 subtends a bud. Con- 

 sequently, the shoot 

 almost resembles in 

 appearance that of R. 

 glacialis, only, in R. 

 sulphiireus, the scale- 

 leaves are absent. The 

 plant probably passes 

 the winter as does R. 

 nivalis (see figure in Kjellmax I.e., p. 493): the sheaths of the 

 fully-developed leaves of the rosette surrounded the shoots of 

 the next year, the leaves and terminal flowers of which are 

 formed even during autumn. 



The height of the flowering plant is usually from 6 to 

 XXXVI. 24 



Fig. 17. R. sulphureus. 



(Scoresby Sound; 18. 7. 1892; '"U). 



I, Main axis; II, the two-leaved principal bud; 



b. the subtending leaf. 



