146 



LARAMIE FLORA OF THE DENVER BASIN. 



Canon City field, but here it was confused with I 

 what has been described as Ficus praetrinervis 

 Knowlton, 22 an exceedingly abundant form in 

 the Vermej o formation. Lesquereux also stated 

 that he had specimens of it from the Raton 

 region of Colorado, but so far as now known it 

 is not present there, the leaves mistaken for it 

 being the larger C. mississippiense, which is 

 confined to the Eaton formation. 23 



The specimens from beds of post-Laramie 

 age at Carbon, Wyo., are probably to be re- 

 ferred to Populus sp. undet., and the specimens 

 obtained by Ward 2 * at Black Buttes, Wyo., 

 have been referred to Ficus trinervis Knowl- 

 ton, 25 a species now known to be of wide dis- 

 tribution. 



The final conclusion is reached that in no 

 authenticated instance has Cinnamomum, a fine 

 been found at a horizon younger than the true 

 Laramie. 



Occurrence: Laramie formation, Marshall, 

 Colo, (types); Marshall, Colo., half a mile 

 south of railway station, collected by F. H. 

 Knowlton, 1908; Rex. mine, Louisville, Colo., 

 collected by A. C. Peale, 1908; Leyden Gulch, 

 6^ miles west of Golden, Colo., collected by 

 A. C. Peale, 1908; Cowan station, 10 miles 

 south of Denver, Colo., collected by F. H. 

 Knowlton. 



Cinnamomum laramiense Knowlton, n. sp. 



Plate XXII, figure 3. 



Cinnamomum laramiense Knowlton [nomen nudum], U. S. 

 Geol. Survey Bull. 696, p. 170, 1919. 



Leaf apparently, rather thin in texture, very 

 narrowly obovate-lanceolate, being, broadest at 

 a point somewhat above the middle, from 

 which'it tapers or rounds rather abruptly to a 

 rounded apex and narrows downward to a 

 wedge-shaped base; triple-nerved, the midrib 

 slender, straight; lateral nerves or ribs of same 

 size as midrib, opposite, arising high above the 

 base and running nearly to the apex of the 

 leaf, with very few branches on the outside; 

 upper secondaries apparently only one pair, less 

 than one-fourth the length of the blade from 

 the apex, running to or near the margin. 



2 . 2 U. S. Geol. SuryeyProf. Paper 101, p. 263, pi. 41, figs. 1-4; pi. 42. fig. 

 1, 1918. 



23 Idem, p. 320, pi. 89, fig. 2. 



« U. S. Geol. Survey Sixth Ann. Kept., p. 558, 1886; U. S. Geol. Survey 

 Bull. 37, p. 43, 1887. 



" U. S. Geol. Survey Bull. 163, p. 42, 1900. 



This leaf, of which only a single one seems to 

 have been found, is about 9 centimeters long 

 and a little less than 3 centimeters wide. 



It is perhaps unwise to attempt the charac- 

 terization of a species of Cinnamomum on a 

 single specimen, but the one in hand seems to 

 differ from others sufficiently to be worthy of 

 independent rank, at least until further material 

 can be obtained. 



Among living species it is perhaps nearest 

 to O. cassia Blume, except that it is relatively 

 rather narrower below. Among fossil forms it 

 approaches a number of species, especially 

 C. lanceolatum as usually depicted from Euro- 

 pean sources. From that species, however, it 

 appears to differ in having a more obtuse apex 

 and only two pairs of secondaries on the midrib. 



Occurrence: Laramie formation, Morrison, 

 Colo., white sandstone near coal seam, collected 

 by Arthur Lakes, 1S90; Cowan station, 10 miles 

 south of Denver, Colo., collected by F. H. 

 Knowlton, 1908. 



Older ROSALES. 



Family PLATANACEAE. 



Platanus platanoides (Lesquereux) Knowlton? 



Plate XIII, figure 1. 



Platanus platanoides (Lesquereux) Knowlton, U. S. Geol. 

 Survey Bull. 152, p. 171, 1899. 



Viburnum platanoides Lesquereux, U. S. Geol. and Geog. 

 Survey Terr. Ann. Rept. for 1874, p. 314, 1876; Ter- 

 tiary flora: U. S. Geol. Survey Terr. Rept., vol. 7, 

 p. 224, pi. 38, figs. 8, 9, 1878. 



One of the original, types of this species, 

 illustrated in the "Tertiary flora," Plate 

 XXXVIII, figure 8, is preserved in the United 

 States National Museum collection (No. 327). 

 It came, according to Lesquereux, from Black 

 Buttes, Wyo. As indicated above, it was de- 

 scribed under the name Viburnum platanoides 

 and was regarded as being rather closely re- 

 lated to Viburnum marginatum (now Platanus 

 manjinata) , from which it differs in having 

 "less numerous, more open, lateral veins, 

 whose branches are more curved in passing up 

 to the borders, and especially by the enlarged 

 truncate or sub truncate base of the leaves." 

 The type specimen is rather fragmentary, but 

 so far as known it has been accurately diagnosed, 

 by Lesquereux. 



Platanus platanoides has since been found 

 in beds of "Lower Laramie" (Medicine Bow) 

 age in Carbon County, Wyo., and has been 



