1 86 ALIEN FLORA OF BRITAIN 



been admirably told by Trimen in the Journal of 

 Botany y 187 1, p. 163. He regarded it as introduced 

 for the following reasons : (i) It is not recorded as 

 wild in this country before 1660, and was expressly 

 stated to be absent by such careful botanists as Turner 

 and Parkinson. If it had existed in any quantity where 

 it is now said to be wild, it could not have escaped 

 their notice. (2) The plant, though common now in 

 many parts of Western Continental Europe, has been 

 satisfactorily proved by Kirschleger to have been 

 introduced there from the East. 



[Arum italicum, Mill. Stated to be absent as a native 

 plant in Northern France, Belgium, and Holland, 

 but in view of the decided opinion of local botanists 

 that it is indigenous in Dorset, Sussex, and Kent, where 

 it grows in natural situations, it cannot be excluded 

 from our native list. Its status has, however, long been 

 open to question in consequence of its cultivation 

 for more than a century in gardens and the suspicion 

 which attaches to some of its stations.] 



Calla palustris, L. Native of marshes in Europe 

 and North America. Completely naturalised in marshes 

 in one spot in Surrey to which its intentional intro- 

 duction has been acknowledged. 



NAIADACE^. 



Naias graminea, Del. Native of the tropics of 

 the Old World. Naturalised in a canal near Man- 

 chester. 



