III.] IMP A TIENS. 77 



Hildebrand has shown that of the foreign species 

 of Oxalis some are dimorphous, some trimorphous. 

 This is, however, not the case with either of our Eng- 

 lish species, and I will therefore postpone any remarks 

 on this curious arrangement until we come to some of 

 the English species in which it occurs. 



Impatiens noli me tangere also produces cleistoga- 

 mous flowers. {Mohl. Bot. Zeit., 1863. Bennett, Linn. 

 Jours., vol. xiii.) The seed capsules, when ripe, burst 

 open if touched. 



