734 GEOLOGY OF THE YELLOWSTONE NATIONAL PARK. 



CeLASTKUS ELLIPTICU8 11. sp. 

 PI. XCVII, tig. 3. 



Leaf of firm texture, nearly reiiularly elliptieal in ontline, aliriiptly 

 rounded above to an obtuse apex and Ijelow to an abnost truneatelv rounded 

 ba.se which is sbglitly decurrent along- a short petiole; margin irregularly 

 sinuate-toothed from a short distance above the base; midrilj rather thick, 

 passing straight to tlie apex; secondaries about 15 ])airs, alternate or sub- 

 opposite, at an even angle of about 35°, straight; distal termination of 

 secondaries unknown; nervilles and finer nervation olisolete. 



This perfect leaf is 7 cm. long and 4.,5 cm. broad. It is very slightly 

 unequal-sided, the difii'erence being, however, hardlv 3 mm. It is very regu- 

 larly elliptical, with a sinuate dentate margin, which begins about one-fourth 

 the length of the leaf from tlie base, the lower portion being entire. The 

 ner\ation is very regular, consisting of about 1.") ])airs of secondaries, which 

 emerge at an angle of aliout 35° and run straight toward the margin, but 

 the manner of the termination at the margin can not be made out, from 

 lack of preservation. It is probable that they arch abruptly near the 

 margin and send secondary nervilles to the teeth. None of the nervilles or 

 iincr nervation can be made out. 



It is possil)le that this species is closely related to C. mceqnaJis, just 

 descriljed, as they come from the same beds, but it seems hardlv proliable. 

 This latter species, as already pointed out, is very unequal-sided, with large 

 sinuate teeth, and peculiar arrangement of secondaries. C. elUpt'ivus, on the 

 other hand, is almost regular in shape, has twice as many and smaller 

 sinuate teeth, ami regular secondaries. 



This species does not approach closely to any described species of 

 Celastrus with vdiich I am familiar. 



Habitat: Yellowstone River, one-half mile below the mouth of Elk 

 Creek, at base of blufi'; collected by F. H. Kuowlton, August, 1888. 



El.eodendron polymorphuji Ward. 



PL XCVII, tig. 1. 



Elirodeiidron poh/inorplnun Ward: Types of tlie Laramie FL, p. 84, PI. XXXVIII, 

 tigs. 1-7. 



The fine specimen figured is referred witli some doubt to this species. 

 It has much the same shape, serration, and tvpe of uer\ation as E. i^ohj- 



