GENTIAN TRIBE. 



419 



4. CHLORA (Yellow-wort). 



1. C. perfolidta (Perfoliate Yellow-wort). The only 

 British species. Chalk and limestone pastures ; not 

 uncommon. An erect plant, 12 18 inches high, re- 



MENYANTHES TRIFOLIATA 



E E 2 



Marsh Trefoil). 



