256 



EuG. Warming. 



each of the axils of the cotyledons, most frequently three 

 serial buds are developed, the uppermost being the largest. 

 Pulvinate forms. In these species, in which the 

 shoots with elongated internodes immediately become pro- 

 strate and spread out in all directions, the typical develop- 

 ment of semi-globular cushions must be very difficult, if 

 not impossible. In places where there is active growth, flat 

 cake-shaped forms can however occur, being formed by the 

 interwoven stems. 



Fig. 13. Stellaria humifusa. 

 A, A branch with both dead and fresh leaves ; a, afresh-green portion. 



Bf An old leaf, the veins are distinctly seen. (Upernivik). 

 C, Z), a leaf magnified and a seedling. (Egedesminde; 28. 7. 1884. )( E.W.) 



F. The Stellaria crassifolia type. 



To this I refer Stellaria crassifolia and ■ — with doubt 

 — S, humifusa. 



This type, which is represented by S. crassifolia, differs 

 from the Cerastium arvense-iype by developing small aerial 

 (and? subterranean) hib er nacul a, organs which live through 

 the winter and consist of short, thick-leaved shoots, rich in 

 starch (Fig. 12). They are developed during the autumn (late 

 summer), are liberated the next year, and then grow out 

 into new plants by developing adventitious roots. Otherwise 

 it resembles Cerastium trigynum in its mode of growth; 

 the leaf-shoots with long internodes proceed from the same 



