752 GEOLOGY OF THE YELLOWSTOXE NATIONAL PARK. 



more or less distinctly wedge-shaped at base, and is obovate rather than 

 elliptical in shape. The nervation is similar in both. 



D. lamarensis is also like certain leaves of D. brachysepala Al. Br., from 

 Florissant and the Fort Union group of Montana. 1 The leaves from the 

 Fort Union group are rather larger, and have the secondaries at a different 

 angle and are without the peculiar finer nervation. It seems best, however, 

 to keep them distinct, at least for the present. 



Habitat: Lamar River, between Cache and Calfee creeks; collected by 

 F. H. Knowlton, August, 1888. Fossil Forest; collected by Arnold Hague, 

 September 24, 1884. 



DlOSPYROS HAGUEI 11. Sp. 

 PL G, fig. 3. 



Leaf coriaceous, elliptical, entire, obtuse at apex and base; petiole 

 thick; midrib thick, flexuose; secondaries about 6 pairs, alternate, very 

 irregular, the pair at the base of the blade thin, vanishing near the margin, 

 next pair strongest, passing to the upper part, camptodrome, branching 

 on the outside and forming broad loops well inside the margin; upper 

 secondaries smaller, camptodrome, forming broad loops; nervilles sparse, 

 strong, percurrent; finer nervation obsolete. 



This species rests on the fine, nearly perfect leaf figured. It is 7 cm. 

 long, including the petiole, which is 14 mm. long and 2 mm thick. The 

 blade is nearly regularly elliptical in shape and 3.3 cm. broad. The nerva- 

 tion is peculiar, as may be drawn from the description and figure. All of the 

 secondaries except the lower pair are camptodrome, forming by union with 

 the one next above a series of broad loops some distance inside the margin. 



This type of nervation is peculiar and is clearly that of Diospyros. It 

 approaches quite closely to certain small-leaved forms of I). virginiana L. 

 Among fossil forms it somewhat resembles Diospyros obtusa Ward, 2 from 

 Sevenmile Creek, Montana, in the Fort Union group. The latter species 

 is of approximately the same size and shape, but differs in the details of 

 nervation. It is, however, quite close. 



I have named this species in honor of Mr. Arnold Hague, of the United 

 States Geological Survey. 



1 Cf. Lesquereux Cret. and Tert. Fl., PI. XXXIV, fig. 1, 2; Ward, Types of the Laramie Fl.. 

 PI. XLIX, fig. 1,2. 



- Types of the Laramie Fl., p. 105, PI. XLIX, fig. 5. 



