FLORA OF THE GREEN RIVER GROUP. 161 



U 1 in n s B r a u n i i , Heer. 



Plate XXVII, Tigs. 1-4,8. 



Heer, " Fl. Tert. Helv.," ii, p. 59. pi. Ixxix, figs. 14-21 ; iii, p. 181, pi. cli, fig. 31 ; Gaud., " Contrib.," ii, p. 47, 

 pi. iii, figs. 3-9; Ludw., " Palseontog.," viii, p. 105, pi. xxxviii, figs. 5-8; Ett.. "Fl. v. Bil.," p. 64, 

 pi. xviii. figs. 23-26 



Leaves shorfc-petioled, vesy unequilateral, round or cordate at base, elliptical or 

 ovate-lanceolate, acute or acuminate, doubly or simply coarsely dentate ; teeth conical, 

 turned up; lateral veins open, at right angles toward the base, 12-18 pairs; fruit peti- 

 olate, broadly-winged; wings lateral. 



This species is very variable in the form of the leaves and the more 



or less acute teeth of the borders. The leaves, 4* to 12 centimeters long, 



2i to 4£ centimeters broad, are comparatively broader and shorter and 



more unequilateral and difform than those of the preceding specie's. It is 



very common in the European Miocene and is also abundantly found at 



Florissant, where the fruits also are not rare. But these fruits, always 



found ripe, do not agree with the figures given by Heer, loc. cit., pi. cli, 



fig. 31 ; they are rather like those of U. Brownii, or U. longifolia, Ung., as 



figured in "Bil. FL," pi. xviii, figs. 4, 5, 8. The specific relation of the 



seeds of Ulmus described by European authors is hypothetical, as well as 



that of those I have figured. 



Hah. — Florissant. Not rare; especially in Princeton Collection. 



PLANERA, Gmel. 

 •'U. S. Geol. Rep.." vii. p 189. 



Planera longifolia, Lesqx. 



Plate XXIX, Figs. 1-13 ; XLIV, Fig. 10. 

 Lesqx., "U. S. Geol. Rep.," vii, p. 189, pi. xxvii, figs. 4-6. 



Planera longifolia, var. myricfefolia. 

 Plate XXIX, Figs. 15-27. 



From a comparison made in the examination of more than two thou- 

 sand specimens, representing not merely the leaves figured but a large 

 number of intermediate forms, I have been forced to admit that they all 

 belong to the same species, and that though some of them are closely allied 

 to the European Planera TJngeri, they constitute a different species. First 

 examining the relation of all the leaves from No. 1, the normal type, to 



C P 11 



