THE FLORA. 



121 



National Museum (No. 468), and in the cata- 

 logue of fossil plants it is recorded in Les- 

 qu'ereux's handwriting as having come from 

 Green River, Wyo. The matrix is not that 

 of Golden but agrees perfectly with the abun- 

 dant material found above the fish beds at 

 Green River, and there is consequently no 

 reason for supposing that this species has 

 ever been found in the Denver beds at Golden. 

 Occurrence: Laramie formation, Coal Creek, 

 Boulder County, Colo., collected by N. L. 

 Britton about ISSO. 



Juglans leconteana Lesquereux. 



Plate VIII, figures 1-3 [types]. 



Juglans leconteana Lesquereux, U. S. Geol. and Geog. 

 Survey Terr. Ann. Eept. for 1870, p. 382, 1872; 

 idem "for 1876, p. 517, 1878; U. S. Geol. Survey 

 Terr. Kept., vol. 7, p. 285, pi. 54, figs. 10-13. 1878 

 [figs. 10-12 here reproduced]. 

 Friederich, Beitriige zur Kentniss der Tertiiirflora 

 von Sachsen, p. 150, p!. 19, fig. 7, 1883 



This species is in much confusion. Three of 

 the specimens figured in the "Tertiary flora" 

 (figs. 10-12) are not now and have apparently 

 never been in the collections of the United 

 States National Museum. They came, accord- 

 ing to Lesquereux, from the Marshall coal 

 mine, in Boulder County, Colo., and are prob- 

 ably lost. The original of Lesquereux's 

 figure 13 is the only one in the United States 

 National Museum (No. 453). It is stated in 

 the "Tertiary flora" to have come from Evans- 

 ton, Wyo., but in the Museum catalogue it is 

 recorded from Black Buttes, Wyo., in Les- 

 quereu.x's handwriting. This last statement 

 is probably correct, for the fossil is preserved 

 in a fragment of the "red baked shale" so 

 characteristic of the upper beds at this place. 



In the annual report of the Hayden Survey 

 for 1870, page 382, this species is recorded in a 

 list of species foimd at Raton Pass, N. Mex., 

 but the specimen or specimens upon which this 

 statement is based has never been in the 

 United States National Museum, and the refer- 

 ence may safely be dismissed as an error. 



Lesquereux has also reported this species 

 from Cherry Creek, Wasco County, Oreg., but 

 there was only a single example, which I ex- 

 cluded from my flora of these beds "- on the 

 ground that it was so poorly preserved as to 

 be impossible of determination. 



M U. S. Geol. Survey Bull. 204, p. 88, 1902. 



Friederich has identified this species with a 

 leaf from the lower Oligocene of Bornstedt, 

 in Saxony, remarking at the same time that 

 he was unable to draw an^^ line between 

 Lesquereux's JiKjlans rugosa, J. rhamnoides, 

 and J. leconteana. He also adds that they 

 might better be referred to Diospyros, a 

 view which can hardly be accepted, for ,/. 

 rugosa at least. Lesquereux himself acknowl- 

 edges that it is hardly possible to distinguish 

 this species from J. rugosa, yet he says: 



It differs liy comparatively shorter, broader leaves, 

 which are first rounded, then abruptly curved or narrowed 

 to the short petiole: by the lateral nerves at a more acute 

 angle of divergence (40°), passing nearly straight toward 

 the borders, with thin simple bows nearer to them. 



Although the differences are not great and 

 might possibly break dowTi with a larger 

 series of specimens for comparison, I have 

 decided to maintain this species as left by its 

 author, especially as the types are nearly all 

 lost, and no additional material is forth- 

 coming. 



Occurrence: Laramie formation, Marshall 

 mine, Marshall, Boulder County, Colo. Post- 

 Laramie (in my opinion), ?Black Buttes, 

 Wyo. Evanston formation ?, ^Evanston, Wyo. 



Juglans praerugosa Knowlton, n. sp. 



Plate V, figure 2; Plate XXI, figure 5. 



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



Survey Bull. 696, p. 396, 1916. 

 Juglans rugosa Lesquereux, Am. Jour. Sci., 2d ser. 



vol. 45, 18"8; U. S. Geol. Survey Terr. Third Ann. 



Kept., p. 96, 1869 [reprint, p. 196, 1873]. 



Leaflets evidently rather thin in texture, 

 ovate or ovate-elliptical, abruptly rounded to 

 the truncate base (apex destroyed) ; margin 

 en the; midrib slender, straight; secondaries 

 apparently six or seven pairs, alternate, at 

 a low angle, camptodrome. 



The specimens upon which this form is of 

 necessity founded are fragmentary, and com- 

 plete characterization is difficult. It appears 

 to be broadly ovate or perhaps elliptical-ovate. 

 It may also possibly be slightly unequal-sided. 

 The length was apparently about 9 or 10 centi- 

 meters, and the width between 4 and 4.5 

 centimeters. 



Juglans rugosa Lesquereux was named in 

 1868 from material obtained from the Marshall 

 mine, Marshall, Colo., but it was neither 

 described nor figured at that time. The only 



