514 T. D. A. Cockered — Descriptions of Tertiary Plants. 



two of the leaves are entire. One of the basal leaf -sheaths, 

 curled backwards, is well preserved, and exactly as in M. 

 trifoliata. The whole plant is much smaller than M. trifo- 

 liata ; the petioles of the better-developed leaves only about 

 28 mm long, with leaflets about 30 mm long, and 9 to 10 broad. 

 The prominent lateral or secondary veins are irregular, less 

 numerous than in M. trifoliata, and more or less strongly 

 arched, with the concave side upwards. The entire leaves are 

 broad-lanceolate to ovate, the largest being over 15 mm broad. 



Fig. 8. Fig. 9. 



Fig. 8. Robinia brittoni. Fig. 9. Menyanthes coloradensis. 



Florissant, Station 13 B (Geo. ISf. Rohwer, 1098) : also one 

 found at the same place by Miss Gertrude Darling. Menyan- 

 thes is to-day a monotypical genus of Holarctic distribution. 

 In the fossil state it is known, principally from capsules and 

 seeds, from Greenland, Spitzbergen, and Central Europe. 

 The occurrence of entire leaves on the fossil is of interest in 

 view of the fact that the allies of Menyanthes are entire-leafed. 

 I asked Dr. L. N. Eritton whether he had ever seen entire 

 leaves on the living species : he replied that no such had ever 

 come under his observation. The seedling of Menyanthes 

 seems not to have been described. 



