APPENDIX. 171 



niakia, of a common high northern species, and a peculiar one in 

 California ; Echinais, of one or two Asiatic species, one of them 

 lately found in California and Colorado, but possibly of recent in- 

 troduction ; and Castanopsis, a rather large and characteristic east 

 Asian genus, represented by a single but very distinct species in 

 Oregon and California. 



Small, under the circumstances, as is the number of cognate plants 

 or forms in these two floras, it is large in comparison with those 

 which are peculiar to the United States and Europe, excluding, as 

 before, all Arctic-alpine species. The following seem to be the 

 principal : — 



Anemone nemorosa, of which there is a peculiar Pacific form, per- 

 haps reaching the eastern borders of Asia. 



Myosorus minimus, which may be a recently introduced plant. 



Cakile, a maritime genus. 



Saxifraga aizoides. 



Bellis integrifolia, which may be compared with the European 

 B. annua. 



Lobelia Dortmanna. 



Primula Mistassinica. 



Centunculus lanceolatus, a mere form of C. minimus. 



Hottonia infiata, which represents H. palustris. 



Utricularia minor. 



Salicomia Virginica, the S. mucronata of Bigelow and probably 

 of Lagasca also. 



Corema Conradi, representing the Portuguese C. alba. 



Vallisneria spiralis, which appears to be absent from northern 

 Asia. 



Spiranthes Bomanzoviana, with its single station on the Irish 

 coast. It extends across the American continent well northward, 

 but seemingly not into the adjacent parts of Asia. 



Eriocaulon septangulare, restricted in the Old World to a few 

 stations on west British coasts. 



Carex extensa, C.flacca (or Barrattii), and one or two others. 



Cinna arundinacea, var. pendula. 



Leersia oryzoides. 



Spartina stricta and S. juncea. 



Equisetum Telmateia. 



Lycopodium inundatum. 



Calluna vidgaris, which holds as small and precarious a tenure 

 on this continent as Spiranthes Bomanzoviana does in Europe. 



