144 



LARAMIE FLORA OF THE DENVER BASIN. 



upper portion for an unknown length. The 

 absence of the apical portion makes it impossi- 

 ble to determine the shape satisfactorily; it 

 appears to be simply narrowly lanceolate, 

 though it may be larger above, which would 

 make it oblanceolate. The portion preserved 

 is a little over 7 centimeters in length and a 

 little under 1.5 centimeters in greatest width. 



This species is quite distinct from anything 

 previously noted in the Laramie and appears 

 to find its closest relative in Laurus oregoniana 

 Knowlton,'* from the Mascall formation 

 (Miocene) of the John Daj- Vallej' , Oreg. That 

 species is very much larger than the leaf under 

 discussion, being some 1 8 centimeters in length 

 and 3.5 or 4.5 centimeters wide, but it has the 

 same shape and general appearance. It differs 

 slightly, however, in having the secondaries 

 markedly alternate and the nervilles much 

 broken. 



Occurrence: Laramie formation. Coal Creek, 

 Boulder County, Colo., mine on road near 

 McNamara's, collected by Arthur Lakes, June, 

 1890. 



Laiirus lakesii Knowlton, n. sp. 



Plate XXII, figure 6. 



Laurus lakesii Knowlton [nomen nudum], U. S. Geol. 

 Survey Bull. 696, p. 340, 1919. 



Leaf of firm texture, lanceolate ; about equally 

 narrowed to both base and apex; midrib 

 slender, straight; secondaries about six or 

 seven pairs, alternate, at a low angle, campto- 

 drome, arching close to the border; finer ner- 

 vation forming quadrangular areolae. 



This little leaf is about 6 centuneters long 

 and 1.2 centimeters wide. The nervation is 

 not very well preserved. 



This species is of the same type as and pretty 

 closely related to what Lesquereux '^ described 

 and figured under the name Laurus primigenia 

 Unger, mainly from Evanston, Wyo., but it 

 is rather smaller and has fewer secondaries at 

 a more acute angle of divergence. 



Lesquereux mentions specimens from Black 

 Buttes, Wyo., and Spring Canyon, Mont., 

 which he at first considered identical with 

 those subsequently described under the name 

 Laurus primigenia Unger, but they were so 

 fragmentary that he hesitated to place them 



" U. S. Geol. Survey Bull. 204, p. 58, pi. 9, figs. 2, 3, 1902. 

 " Lesquereux, Leo, The Tertiary llora: U. S. Geol. Survey Terr. 

 Rept., vol. 7, p. 214, pi. 36, figs. 5, 6, 8, 1878. 



together. It is possible that they may prove 

 to be the same as the leaf here described. 



The leaf described above as Laurus lanceolata 

 is of about the same size and shape as the 

 present one but differs markedly in its primary 

 nervation. 



Occurrence: Laramie formation, Coal Creek, 

 Boulder County, Colo., collected by Arthur 

 Lakes, 1890. 



Laurus wardiana Knowlton. 



Plate XVI, figure 1 (type). 



Laurus wardiana Knowlton, U. S. Geol. Survey Bull. 152, 

 p. 129, 1898. 



Laurus ocoteoides Lesquereux, Tertiary flora; U. S. Geol. 

 Survey Terr. Kept., vol. 7, p. 215, pi. 36, fig. 10, 

 1878; U. S. Geol. and Geog. Survey Terr. Ann. 

 Rept. for 1876, p. 510, 1878. [Lesquereux's original 

 figure of the type is here reproduced.] [Homonym, 

 Laurus ocoteaeoides Massalongo, Sjnaopsis florae 

 fossiUs senogalliensis, p. 57, pi. 24, fig. 3; pi. 40, 

 fig. 1, 1858.] 



Th£ type of this fine species is preserved in 

 the United States National Museum (No. 905) 

 and is the only specimen ever obtained from 

 the Laramie. It comes from the hard white 

 sandstone at Golden, Colo., and therefore be- 

 longs in the Laramie. 



Occurrence: Laramie formation, Golden, 

 Colo. ?Dawson arkose, near Mosby, Colo., 30 

 feet above the coal. 



Malapoenna louisvillensis Knowlton, n. sp. 



Plate VII, figure 5. 



Malapoenna louisvillensis Knowlton [nomen nudum], 

 U. S. Geol. Survey Bull. 690, p. 379, 1919. 



Leaf of medium size, narrowly ovate-lan- 

 ceolate, apparently wedge-shaped at the base, 

 narrowly acuminate at the apex; margin 

 perfectly entire; midrib strong, straight; secon- 

 daries about tlireo pairs, opposite or subop- 

 posite, at an angle of nearly 80°, the lower pair 

 ascending far above the middle of the blade, 

 with few outside branches, camptodrome; 

 nervilles numerous, mainly broken or irregular; 

 finer nervation forming a complete irregular 

 network. 



This species is represented by two fragmen- 

 tary specimens, of which the larger and better 

 is figured. As this specimen lacks both base 

 and apex it is impossible to ascertain the length, 

 tliough it must have been about 8 centimeters; 

 the width is a little less than 3 centimeters. 



