FOSSIL FLORA. 743 



seemingly craspedodrome, occasionally brandling- near tlie maro-in; finer 

 nervation not preserve<l. 



The specimen fioured is the only one that has lieen found. It is 14 

 cm. long without the petiole, which is 4.5 cm. in length. Botli sides of tlie 

 leaf are destroyed, but it was probabl}- aliout 10 cm. Avide. 



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

 bluff about 40 feet ahnve the river: collected ])j F. H. Knowlton, August 

 27, 1888. 



TILlXiEJE. 



TlLIA I-OPTLIFOLIA Lx. 



liliit popiilifolia Lx.: Cret. and Tert. Fl., p. 179, PL XXXIV. tig.s. S, n. 



A single large, fairly well preserved .specimen is all that has lieen 

 found of this species It is referred with \-ery little doubt to Lesquereux's 

 species, which was before known only from Florissant, Colorado. It is a 

 little less heart-.shaped at base than fig. 8 (loc. cit.) of Lesquereux's plate, 

 but in the discns.sion of this species Lescpiereux describes it as "round or 

 subcordate at base." The teeth are of ijrecisely the same character, beino- 

 only slightly smaller. Tlie thick petiole and fine palmate nervation are 

 identical, as is the other secondary nervation. 



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

 Creek, top of l)luff: collected by F. H. Knowlton, August --'7, 1888. 



CtREWIOPSIS ? ALDERSOXI 11. sp. 



Leaves of firm texture, broadly ol^ovate, truncate or sliglith- heart- 

 shaped at base, olitusely acuminate above; margin entire at base, slightly 

 undulate-toothed above; midrib thick, straight; nervation pinnate; second- 

 aries about 6 pairs, alternate, at an angle of 4;")°, camptodrome; lowest 

 pair subopposite, arising some distance above the base of the blade, with 

 3 or 4 tertiary branches from the outside which are camptodrome and 

 arch well inside the margin; upper secondaries occasionall}- forked near 

 the margin; nervilles strong, percurrent. 



I refer several .specimens to this somewhat dou1)tful species. Neither 

 of them are perfect, but as far as can be made out the average length 

 appears to have been about 9 cm. and the width about 6 em. 



It is doubtful if these leaves Ijelong to the genus Grewiopsis, but at 



