FLORA OF THE DAKOTA GROUP. 83 



TILIACE^. 



GREVIOPSIS, Sap. 



The remark made on the definition of this genus, "U. S. Geol. Rep.," 

 vii, p. 257, is applicable also to the Cretaceous leaves which I have 

 described under this generic name. The character of the nervation 

 especially relates them to those figured by the celebrated author in the 

 "Sezanne Flora." 



Greviopsis Haydenii, Lesqx. 

 " U. S. Geol. Rep.," vi, p. 97, pi. iii, figs. 2, 4; xxiv, fig. 3. 



The leaf represented in this last figure was described first in '"Amer. 

 Jour. Sci. and Arts," July, 1868, as Populites flahellata. 



ACERACE^. 



ACERITES, Newby. 



Acerites pristiuus, Newby. 

 "Later Ext. Fl.," p. 15; "Illustr.," pi. v, fig. 4. 



Leaves petiolate, cordate at the base, flve-lobed; lobes eutire, acnte;? five strong 

 and nearly equal veins radiate from the base into the lobes. The small nerves are 

 distributed over the surface in a tine net-work of which the meshes ar.i sub-rect- 

 angular. ( Ny.) 



The figure represents a fragmentary leaf of the same character as 



those described and figured in "U. S. Geol. Rep.," vi, p. 56, pi. ii, figs. 1, 



3, under the name of Liquidamhar integrifoUum. The relationship of these 



leaves seems to be with the Araliacece, but it is as yet unascertained. 



Negiindoides acutifolius, Lesqx. 



"U.S. Geol. Kep.," vi, p. 97, pi. xxi, fig 5. 



SAPINDACE^. 



SAPmDUS, Linn. 



S a p i n d u s M o r r i s o ii i , sp. nov. 

 Plate XVI, Figs. 1,2. 



Leaflets subcoriaceous, short petioled, lanceolate -acuminate, unequal at the 

 rounded narrowed slightly decurriug base; lateral nerves alternate, parallel, curving 

 in passing to the borders, camptodrome. 



The fragment represents apparently the base of a large pinnately 



