146 



LARAMIE FLORA OF THE DENVER BASIN. 



Canon City field, but here it was confused with 

 what has been described as Ficus praetrinervis 

 Knowlton,^^ an exceedingly abundant fomi in 

 the Vermejo formation. Lcsquereux 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 Raton formation." 



The specimens from beds of post-Laramie 

 age at Carbon, Wye, are probably to be re- 

 ferred to Populus sp. undet., and the specimens 

 obtained by Ward -^ at Black Buttes, Wyo., 

 have been referred to Ficus trinervis Knowl- 

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

 tribution. 



The final conclusion is reached that in no 

 authenticated instance has Cinnamonmm affine 

 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, 

 6i 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 midrjb, 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 onl}- one pair, less 

 than one-fourth the length of the blade from 

 the apex, running to or near the margin. 



n U. S. Oeol. Survey Prof. Paper 101, p. 263, pi. 41, flgs. 1-4; pi. 42. fig. 

 I. 191S. 



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



"U.S. Geol. Survey Sixth Ann. Rept., p. 558, 1886; U. S. Geol. Survey 

 Bull. 37, p. 43, 1887. 



«i U. S. Geol. SiiTvey BuU. 163, p. 42, 1900. 



This leaf, of which only a single one seems to 

 have been found, is about 9 centimetei-s 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 bo obtained. 



Among living species it is perhaps nearest 

 to C. cassia Blume, except that it is relatively 

 rather narrower below. Among fossil forms it 

 approaclies 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, 1890; Cowan station, 10 miles 

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

 Knowlton, 1908. 



Order 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 Vihurnum marginatum (now Platanus 

 mai-ijinata) , 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 subtruncate base of the leaves." 

 The type specimen is rather fragmentary, but 

 so far as known it has been accurateh' diagnosed 

 by Lesquereux. 



Platanus platanoides has since been found 

 in beds of "Lower Laramie" (Medicine Bow) 

 age in Carbon County, Wyo., and has been 



