228 V. SUMMARY OF DISTRIBUTION. 



Saxifraga liivta. Deemed a true species in Bab. Man. 



affiuis. Also kept a species in Bab. Man. 



pedatifida. A doubtful and confused species. 

 Erica mediterranea. In Western France and Spain. 

 Mackaii. A variety of E. Telralix ? Variable. 

 Arbutus Unedo. From South-west France to Greece. 

 Daboecia polifolia. West France, Spain, Azores. 

 Pinguicula grandiflora. A variety of P. vulgaris ? 

 Oplirys getnmipara. Not ascertained elsewhere. R-ire. 

 Sisyrinchium anceps. Doubtful native. From America ? 

 ~ Allium Babingtonii. Doubtful species. Doubtful native. 



Potamogeton longifolius. Doubtful species ; imperfectly known. 

 Naias flexilis. Recently found. Easily overlooked. In Germany, Sec. 

 Carex Buxbaumii. In North and Middle Europe. 

 Arundo " Lapponica." Said to be a variety of A. striata. 

 Asplenium anceps. A variety of A. Trichomanes ? 



acutum. A variety A. Adiaiilum-nigrum ? 

 Trichomanes radicans. Spiiin, Azcires, Madeira, &c. 



2. Explanations of the Summary. 



The preceding summary is intended to condense the leading facts of 

 species-distribution into a tabular form, so as to admit of comparisons 

 being readily made under the several heads. The list includes denizens 

 and colonists along with the species presumed to be native in Britain ; 

 those more usually or more strongly suspected to be introduced aliens 

 being omitted. A considerable number of segregate species will be 

 observed in the list, especially many very dubious species of Ruhvs and 

 Hierarium. It may be thought by some botanists, that in other 

 instances several aggregate species have been too little subdivided. 

 The course was not always optional ; having regard to the objects 

 sought by the summary. Occasionally, the choice was taken in accord- 

 ance with the writer's own views about the expediency and facility of 

 distinguishing the alleged species themselves. Occasionally, the choice 

 became more compulsory, through the impossibility of assorting the 

 records of their localities, if old aggregates were much divided into 

 modern segregates. The list of species must thus be understood to 

 represent, not simply and exclusively the individual author's own views 

 about the facts of nature, but those views considerably modified, in 

 order to meet the manner in which the same facts have been regarded 



