486 



Transactions of the Society. 



Polygonum amphihiiim. 



Edgeworth figures the pollen of P. hydro- 

 piper as spherical and covered with 

 knobs, like some golf-balls. Other 

 species, as, for instance, P. bistorta 

 (which are entomophilous), are el- 

 liptic. 



* Kerner, ii. p. 105. 



t Knuth, Handbuch der Bliiten Biologie, ii. p. 389. 



X Mohl 



