292 EuG. Warming. 



The Alps. Homogamy; in unfavourable weather self-pollinating 

 to a high degree; specimens with partially shrunken stamens occur 

 (H. M.). Italy. Homogamy (Ricca). — The flower appears to be 

 exactly similar everywhere. Abortive stamens have hitherto been 

 recorded only from Greenland and Norway. 



5. Cerastium vulgatium L. (C. triviale Lin Nr.) 



Denmark. Gynodioecism. ^ slightly protandrous or 

 almost homogamous; self-pollination takes place by the 

 stigmas coming into contact with the anthers of the erect 

 stamens. Sometimes all the cal.-anth. may be open, while 

 the styles are still rolled up in the middle of the flower. The 

 stamens usualfy stand more or less erect, especially the cal.-st. 

 The anthers are white. The flower varies in diameter accord- 

 ing to its age ; at first it is about 5 mm in diameter, and 

 afterwards as much as 8 mm. The styles bend to the right 

 in the flower. 



In a few cases protogyny appears to occur. 



$ with stamens aborted in varying degrees, some about 

 2 mm long, with rather large and almost normal anthers, 

 others only 1 — l^/a mm long with transparent anthers which 

 are, however, somewhat normal in form. Styles large, twisted 

 (to the right), papillose down to their base, and filhng the 

 throat of the corolla. The corolla somewhat smafler than in 

 ^, the petals being 3^2 — 41/2 mm, while those in ^ are 5 — 7, 

 most frequently 5 — 6 mm. The pistil is not, on the whole, 

 more vigorous than in 5, if anything smaller; the 'ovary is 

 about 2 mm long in both. $ plants are rarer than ^. 



Specimens with partially aborted stamens occur. 



Iceland (Reykjavik; 1884). Gynodioecism. ?: petals 

 5 mm, cal.-st. 3 mm, ovary 2 mm and styles 2 mm. Some 

 flowers had normal anthers, that is, they opened and con- 

 tained pollen, which, however, appeared to be almost useless. 



Sweden. Slight protandry; fertilized by self-pollination 

 (Axell). Germany. Gynodioecism; Gynomonoecism. Slight protan- 



