148 



LARAMIE FLORA OP THE DENVER BASIN. 



rather, as these would appear when opened and 

 lying in a rock. The identification is to be 

 regarded as tentative, but whatever then- 

 nature, they are very definite organisms and 

 undoubtedly may be easily recognized in 

 future. 



Occurrence: Laramie formation, Erie, Colo. 



Leguminosites? laramiensis Knowlton, n. sp. 



Plate XVII, figure 4. 



Leguminosites? laramiensis Knowlton [nomen nudum], 

 U. S. Geol. Survey Bull. 696, p. 353, 1919. 



Leaflet narrowly obovate-lanceolate. broad- 

 est well above the middle, whence it narrows 

 evenly in wedge-shaped form to the base and 

 more abruptly to the more obtusely acuminate 

 apex; margin entire; midrib relatively very 

 thick; "secondaries thin, obscure, apparently 

 about eight pairs. 



This is a small leaf or leaflet 3 centimeters 

 long and about 1 centimeter wide. It is pre- 

 served on a rather coarse grained sandstone, 

 which has retained but little trace of the ner- 

 vation. It is so poorly characterized that the 

 generic reference is very uncertain, hence it is 

 not worth while to institute comparisons with 

 described species, as they might be very 

 misleading. 



Occurrence: Laramie formation, opposite 

 sand-lime brick works about 4 miles north of 

 Colorado Springs, Colo., collected by A. C. 

 Peale and G. I. Finlay, 1908, on' same stone 

 with Dombeyopsis trivialis. 



Mimosites marshallanus Knowlton, n. sp. 



Plate XVI, figure 4. 



Mimosiies marshallanus Knowlton {nomen nudum], U. S. 

 Geol. Survey Bull. 696, p. 387, 1919. 



Leaflet small, narrowly obovate, very ob- 

 tusely pointed at the apex and wedge-shaped 

 at the base, 2.75 centimeters long, 14 milli- 

 meters wide; margin perfectly, entire; nerva- 

 tion faint, consisting of a slender midrib and 

 apparently two or three pairs of secondary 

 branches. 



This little leaflet is the only one observed. 

 It is perfect so far as outline goes, but the 

 nervation is obscure. It appears to have been 

 sessile, as the base is slightly enlarged. 



Occurrence: Laramie formation, Marshall, 

 Colo., railroad cut between old and new sta- 

 tions, collected by A. C. Peale, 1908. 



Cassia? laramiensis Knowlton, n. sp. 



Plate XIX, figure 3. 



Cassia? laramiensis Knowlton [nomen nudum], U. S. 

 Geol. Survey Bull. 696, p. 146, 1919. 



Leaflet small, about 3 centimeters long and 

 1.3 centimeters wide, ovate or elliptical-lanceo- 

 late, rather abruptly rounded at the base, 

 obtusely pointed at the apex; margin appar- 

 ently entire; nervation rather obscure, consist- 

 ing of a rather strong midrib and seven or 

 eight' pairs of thin, alternate or subopposite 

 camptodrome secondaries. 



This little leaf or leaflet is so obscurely pre- 

 served that it is hardly worth a name and 

 description. It lacks most of the margin, and 

 this fact of course obscures its affinity. It is 

 referred provisionally to the genus Cassia. 



Occurrence: Laramie formation, Marshall, 

 Colo., collected by A. C. Peale, 1908. 



Cercis eocenica Lesquereux. 



Cercis eocenica Lesquereux, U. S. Geol. and Geog. Survey 

 Terr. Ann. Rept. for 1872, p. 384, 1873. 



Lesquereux's description and remarks con- 

 cerning this species are as follows : 



Leaf nearly round, entire, of a thin texture, smooth 

 surface, deeply cordate at base, nervation of Cercis cana- 

 densis. 



The leaf has its point destroyed; it is apparently obtuse 

 or rounded. Except that it iB more deeply cordate than 

 the average leaves of our Cercis canadensis, there is no 

 difference whatever between the fossil leaves and those 

 of the living species. 



So far as known this species was not again 

 referred to by Lesquereux, and it should prob- 

 ably be omitted from further consideration; 

 yet it is described so definitely that apparently 

 it could be recognized if it should be found, 

 and for this reason it is retained. 



Occurrence: Laramie formation, Erie, Colo. 



Order SAPINDALES. 



Family CELASTRACEAE. 



Celastrinites alatus Knowlton, n. sp. 



Plate XXV, figures 4, 5; Plate XXVI, figure 1. 



Celastrinites alatus Knowlton [nomen nudum], U.TS. Geol. 

 Survey Bull. 696, p. 152, 1919. 



Leaves thin, membranaceous, ovate or 

 broadly ovate, extended above into a short, 

 sharp acumen and below in,to a rounded or 

 slightly wedge-shaped base, which is extended 

 down the petiole, producing a decided wing; 



