120 



LARAMIE FLORA OF THE DENVER BASIN. 



Juglans newberryi Knowlton, n. sp. 



Plate XX, figures 8-10. 



Juglans newberryi Knowlton [nomen nudum], U. S. Geol. 

 Survey Bull. 696, p. 335, 1919. 



Leaves or leaflets large, about 15 centimeters 

 long and 4.5 or 5 centimeters wide, with 

 entire margins; blade long, narrow, wedge- 

 shaped and strongly inequilateral at base, rather 

 long-acuminate at apex; midrib thick, strong; 

 secondaries alternate, numerous (about 20 

 pairs), at an open angle, camptodrome, ■arch- 

 ing and joining just inside the borders, some- 

 times festooned outside the arches; interme- 

 diate secondaries numerous, often extending 

 nearly to the margin; nervilles strong, mainly 

 percurrent and oblique to the secondaries; 

 reticulation obsolete. 



This fine species is represented by four 

 specimens, none of which, however, is pre- 

 served entire. Two of them have the bases 

 preserved, one the apex, and the other repre- 

 sents a segment near the middle of the blade. 

 They are rather long, narrow leaflets, strik- 

 ingly inequilateral at the base and acuminate 

 at the apex. 



This species calls to mind a number of fossil 

 forms, yet when carefully compared with them 

 it is found to differ from all. It has, for ex- 

 ample, much the shape and size of Juglans 

 denticulata Heer, or J. crossii Knowlton, as it 

 is now called, 56 which differs in having numer- 

 ous sharp teeth. It also suggests certain of 

 the narrower leaflets of J. rugosa Lesquereux, 57 

 which differs in general in being more or less 

 heart-shaped at the base and in having fewer 

 secondaries. . 



Juglans acuminata Al. Braun, 58 of the Swiss 

 Miocene, which, by the way, it is almost im- 

 possible to distinguish from J. rugosa, has 

 much the same nervation and size as J. new- 

 berryi but differs in shape. Juglans califor- 

 nica Lesquereux, 59 from the auriferous gravels 

 of California, is not greatly unlike the form 

 under discussion, differing in being obtuse at 

 the apex and less unequal-sided at the base. 



I have named this species in honor of the 

 late Dr. J. S. Newberry, who did so much to 

 develop the paleobotany of the Rocky Moun- 

 tain region. 



m U. S. Geol. Survey Bull. 152, p. 122, 1898. 



57 U. S. Geol. Survey Terr. Rept., vol. 7, p. 286, pi. 55, figs. 1-9, 1878. 



ss Flora tertiaria Helvetiae, vol. 3, pi. 128, figs. 1-10. 



5> Harvard Coll. Mus. Comp. Zoology Mem., vol. 6, pi. 9, fig. 14, 1878. 



Occurrence: Laramie formation, Erie, Colo., 

 collected by N. L. Britton about 1880. ' 



Juglans laramiensis Knowlton, n. sp. 



Plate XX, figure 12. 



Juglans laramiensis Knowlton [nomen nudum], U. S., 

 Geol. Survey Bull. 696, p. 334, 1919. 



Leaflets coriaceous, long and narrowly ovate- 

 lanceolate, often slightly unequal-sided at the 

 base, rather gradually narrowed from the 

 widest point, which is about one-fourth the 

 length of the blade, to the bas.e and upward to 

 the long, narrow acuminate apex; margin 

 entire; nervation strongly and plainly marked, 

 consisting of a rather strong, straight midrib 

 and some 9 or 10 pairs of alternate or sub- 

 opposite secondaries which arise at an angle, 

 curve considerably upward, and disappear 

 close to the margin or, especially in the upper 

 part, join the secondary next above; nervilles 

 numerous, strong, both percurrent and broken, 

 inclining to be at right angles to the midrib on 

 one side of the blade and to the secondaries on 

 the other side; finer nervation not retained. 



This strongly marked species is represented 

 by several specimens, one of the best of which 

 is figured. They are lanceolate or very 

 narrowly ovate-lanceolate, with an obtusely 

 wedge-shaped base and a long, gradually 

 narrowed, sharp-pointed apex. The larger of 

 these two examples is 9.5 centimeters in 

 length and about 3 centimeters in width; the 

 smaller is about 8 centimeters in length and 

 2.25 centimeters in width. The petiole is not 

 preserved in either. 



This species is very suggestive of Juglans 

 schimperi Lesquereux, 60 from the Green River 

 formation at Green River, Wyo.- It is of 

 practically the same shape and size but differs 

 in having only 9 or 10 instead of some 18 pairs 

 of secondaries, which are at a more acute angle 

 and rather more arched upward, while the 

 nervilles are stronger, more commonly per- 

 current, and at right angles to the midrib on 

 one side. 



In his treatment of Juglans schimperi in the 

 "Tertiary flora" Lesquereux states 61 that the 

 original of his Plate LVI, figure 9, came from 

 Golden, Colo. This particular specimen is 

 fortunately preserved in the United States 



»o The Tertiary flora: U. S. Geol. Survey Terr. Rept., vol. 7, pi. 56, 

 figs. 5-10, 1878. 

 « Idem, p. 288. 



