LANCE FLORA OF EASTERN WYOMING 141 



Cercidiphyllum ellipticum (Newberry) Brown 

 (Plate 10, Figs. 2-1) 



Cercidiphyllum ellipHcum (Newberry) Brown, Jour. Paleontol., vol. 13, no. 5, 491, pl. 52, figs. 1-17, pl. 54, figs. 



8, 9-11, 14-16, 1939 (see synonymy). 

 Populus elKplica Newberry, Ann. New York Lyc. Nat. Hist., vol. 9, 16, 1868; U. S. Geol. Surv. Mon. 35, 43, 



pl. 3, figs. 1, 2, 1898. 

 Trochodendroides nebrascen-sis (Newberry) Dorf, Carnegie Inst. Wash. Pub. No. 508, pt. I, 61, pl. 11, figs. 



1, 4, 6, 7, 1938 (see synonymy); BuII. Geol. Soc. Amer., vol. 51, 218, 220, 222, 225, 1940. 

 Trochodendroides sp., Dorf, BuII. Geol. Soc. Amer., vol. 51, 218, 220, 225, 1940. 



The somewhat variable leaves of this species are not so abundant in the type Lance flora 

 as they are in the Medicine Bow and Denver. Only 9 specimens from three localities have been 

 found. The figured specimen, though not complete, shows the typical ovate-elliptic shape, 

 rounded base, and toothed margin which serve to distinguish this species from others. The 

 venation, which is known to be variable, is of precisely the character seen in several of the numerous 

 Medicine Bow specimens of this species in the Princeton and University of California collections.' 

 Numerous specimens from the Hell Creek formation in the collections of Princeton University 

 (Corbin collection) are also of precisely the same character. 



Brown's recent studies of this and related species have shown that leaves of the form referred 

 to Cercidiphyllum ellipticum are widely distributed, and usually abundant, in the Upper Cretaceous 

 of the Northern Hemisphere. It is apparently also known, though of rare occurrence, in the early 

 Paleocene of North America. 



The generic status of this species has been satisfactorily clarified by Brown's discovery of the 

 characteristic fruits and seeds of Cercidiphyllum in association with the leaves, which had already 

 previously been regarded as of the Cercidiphyllum form. Brown has found the leaves, fruits, and 

 seeds in association at no less than thirty localities in the Upper Cretaceous and Tertiary deposits 

 of the United States. In the Lance Creek collections there are associated fruits, hitherto called 

 Leguminosites arachioides minor, but none of the small winged seeds have been detected. 



Occurrence— Localities P3652, P3858, P3859. 



Collection—V. C. Mus. Pal., Plesiotypes Nos. 2512, 2513, 2514. 



Family NYMPH^ACEiE 



Genus NELUMBO Adanson 



Nelurabo tenuifolia (Lesquereux) Knowlton 



(Plate 10, Fig. 10) 



Nelumbo tenuifolia (Lesquereux) Knowlton, U. S. Geol. Surv. Prof. Paper 130, 141, pl. 26, fig. 7, 1922; U. S. 



Geol. Surv. Prof. Paper 155, 92, pl. 41, fig. 2, 1930. Berry, Canada Geol. Surv. Mem. 182, 37, pl. 7, 



figs. 2, 3, 1935. 

 Nelumbium ienuifolium. Lesquereux, U. S. Geol. and Geog. Surv. Terr., Ann. Rept. (1873), 402, 1874; Rept. 



U. S. Geol. Surv. Terr., vol. 7, 253, pl. 46, fig. 3, 1878. 

 Nelumbium lakesianum Lesquereux, U. S. Geol. and Geog. Surv. Terr., Ann. Rept. (1873), 403, 1874. 

 Nelumbium lakesii Lesquereux, Rept. U. S. Geol. Surv. Terr., vol. 7, 2.52, pl. 46, figs. 1, 2, 1878. 

 Nelumbo lakesiana (Lesquereux) Knowlton, U. S. Geol. Surv. Prof. Paper 101, 308, 1917; U. S. Geol. Surv. 



Prof. Paper 155, 91, pl. 41, fig. 1, pl. 42, fig. 2, 1930. 



In the collection borrowed from the U. S. National Museum there is a single fairly complete 

 specimen which agrees in all essential details wilh the characters of the type specimens of Nelumbo 

 tenuifolia. Berry has recently properly united N. lakesiana with the former species on the basis 

 of similarity of significant features. 



As at present interpreted, this species is fairly widely distributed in the late Cretaceous sedi- 

 ments of the Rocky Mountain region and may possibly continue into the early Paleocene. It has 

 been reported on adequate material from the Laramie, Denver, and Raton formations of Colorado, 

 the Lance of Wyoming, and the Whitemud and middle Ravenscrag (7) of Saskatchewan. It is 



1 Dorf, E., Camegie Inst. Wash. Pub. No. 508, pt. I, pl. 11, fig. 6, 1938. 



