290 



Eue Warming. 



do not doubt that as a rule self-pollination takes place im- 

 mediately after the opening of the bud. The stigmatic 

 papillæ extend almost to the base of the styles; the latter 



Fig. 27. Cerastium trigynum. 



A — C, from West Greenland (gathered partly by Rosenvinge). 

 A : § ; length of petals 7 — 8 mm ; styles erect. B, C : Parts of the same 

 flower; self-pollination (6. 8. 1884). 



D—E, from East Greenland (P. Eberlin; 30. 7. and 5. 8. 1885). 

 D, Two abortive stamens; one contains some pollen. E with e 1 — e 3 : 

 a remarkable, small-flowered form; all the cal.-st. are open and are 

 partially empty; cor.-st. still full of pollen, but are in the act of opening. 



F, G, from Norway (Tromsö). F, f 1 : $ with quite transparent 

 anthers which are, however, almost normal in form. G, base of a 

 stamen. 



