FLORA OF THE GREEN RIVER GROUP. 151 



ALNUS, Tourn. 



"U.S. Geol. Rep.," vii. p. 139. 



Alnus Kefersteinii, Goepp. 



Ibid., p. 140, pi. xviii, figs. 6-8; Ixiv, fig. 11. 



Alniis infeqiiilateralis, Lesqx. 

 Ibid., p. 141, pi. Ixii, fig». 1-4. 



A 111 US cor da til, sp. nov. 



Leaf cordate at base, pyramidal and acuminate, doubly serrate on the borders, 

 long-petioled; primary nerves thick, the lateral opposite, parallel, 8 pairs, at acute 

 angles of divergence, curving in passing to the borders, craspedodrome. 



The leaf is 6 centimeters long, has a thick petiole 3 centimeters long, 

 is largest near the cordate base (3 centimeters), and hence tapering to an 

 acute point and dentate all around. The leaf resembles Alnus diluviana, 

 Ung., "Iconogr.,"' pi. xvi, fig. 16, but is more acutely tapering to the point, 

 and the lateral nerves, at a more acute angle of divergence, are more 

 curved. 



Hah. — Florissant. Lacoe's Cabinet, No. 83. 



Flowers of Alnus, pi. xxxix, fig. 3, are also found at Florissant, but 

 are not identifiable in species. 



CUPITLIFEE^. 



OSTRYA, Michx. 



"U. S. Geol. Eep.," vii, p. 142. 



Ostrya betuloides, ep. nov. 



Leaves small, broadly ovate, acute, rounded to the equilateral base; borders 

 dentate; lateral nerves close, at a broad angle of divergence. 



The leaf is of the same size and shape as that of Ostrya Atlantidis, 

 Sap., "Et.," ii, 2, p. 254, pi. vi, fig. 4, differing in the simple teeth of the 

 borders, which give to the leaf the appearance of a Betula; but there is 

 with the same specimen a fragment of an involucre of Osfrya, similar in 

 size to that of Sap., fig. 11, I. c, and still more to Ostrya tenerrima, Sap., 

 "Et.," i, 2, p. 49, pi. V, fig. 6, differing only from the last by its larger size 

 (2 centimeters long). Possibly this involucre is referable to the same 

 species as the leaf. It is the only one seen, as yet, from this formation. 



ifrt5._Florissant. Lacoe's Cabinet, Nos. 26 and 29. 



