116 



LARAMIE FLORA OF THE DENVER BASIN. 



Rocks specimens in the present comparisons 

 and discussions. Additional specimens from 

 Point of Rocks were procured by L. F. Ward 

 in 1883, 44 but none have been found in or about 

 the supposed Greeley locality. 



In the light of material recently studied it 

 now seems probable that the specimen from 

 the North Fork of Dutton Creek, Laramie 

 Plains, Wyo., which I figured and described 

 under the name Gunninghamites? sp., 45 should 

 be referred to the present form. Although the 

 full characters can not be made out, owing to 

 poor preservation, the general appearance is 

 the same as in many specimens that un- 

 doubtedly belong to Sequoia longifolia. 



It was suggested by Schenk 48 a number of 

 years ago that Lesquereux's Sequoia longifolia 

 should be referred to the genus Geinitzia, and 

 as cones had not been found at that time, I 

 ■adopted the suggestion and in my "Flora of 

 the Montana formation" 47 transferred it to 

 this genus. Although cones have not been 

 found in connection with these specimens, -they 

 have been found attached to specimens that 

 are now described under the name Sequoia 

 magnifolia Knowlton, 48 and as these two forms 

 are undoubtedly congeneric it is best to refer 

 them all to Sequoia. 



The material from Marshall, Colo., includes 

 several specimens of coniferous branches that 

 are not to be distinguished from Sequoia 

 longifolia as described and figured by Les- 

 quereux from Point of Rocks, Wyo. One of 

 the best of these branches is here figured. It 

 is a thick branch 1 centimeter in diameter and 

 about 15 centimeters long. The scars on the 

 branch and the insertion of the long, slender, 

 acuminate leaves are the same as shown in 

 figure 29 of Plate LXI in the "Tertiary flora." 

 The manner in which the leaves are matted 

 together is also the same, and there can be no 

 reasonable doubt of their identity with Les- 

 quereux's species. 



A single poorly preserved branchlet (shown 

 in PL IV, fig. 2) from Cowan station, south of 

 Denver, appears to bejong to this species. 



« Knowlton, F. H., U. S. Geol. Survey Bull. 163, p. 28, 1900. 



« Idem, p. 29, pi. 5, fig. 3. 



« Schenk, A., in Zittel, K. A., Handbuch der Palaeontologie, Abt. 2, 

 pp. 301, 302, 1880. 



« Knowlton, F. H., U. S. Geol. Survey Bull. 163, p. 28, 1900. 



« Knowlton, F. H., The Bora of the Fox Hills sandstone: U. S. Geol. 

 Survey Prof. Paper 98, p. 88, pi. 15, figs. 1-3, 1916. 



Occurrence: Mesaverde formation, Point of 

 Rocks, Wyo. (type locality). Laramie forma- 

 tion, Marshall, Colo., railroad cut between old 

 and new stations, collected by A. C. Peale, 1908 ; 

 Cowan station, 10 miles south of Denver, Colo., 

 collected by F. H. Knowlton, 1908. 



Order CYCADALES. 



Family CYCADACEAE. 



Cycadeoidea mirabilis (Lesquereux) Ward. 



Cycadeoidea mirabilis (Lesquereux) Ward, Biol. Soe. Wash- 

 ington Proc, vol. 11, p. 86, 1894. 



Zamiostrobus mirabilis Lesquereux, U. S. Geol. and Geog. 

 Survey Terr. Bull., vol. 1, No. 5, 2d ser., p. 383, 

 1876; idem, Ann. Bept. for 1874, p. 309, 1876; 

 Tertiary flora: U. S. Geol. Survey Terr. Bept., vol. 

 7, p. 70, pi. 63, figs. 1-ld, 1878. 



Nelumbium James, Science, vol. 3, p. 434, 1884. 



Clathropodium mirabile (Lesquereux) Ward, Science, vol. 

 3, p. 532, 1884. 



Cycadeoidea zamiostrobus Solms, Beal. accad. sci. 1st. 

 Bologna Mem., 5th ser., vol. 2, p. 210, 1892. 



. It is extremely doubtful whether this species 

 should properly be included in this work, but 

 I have given it the benefit of the doubt. It 

 was found by F. V. Hayden lying on the sur- 

 face of the ground near Golden, Colo., within 

 the Laramie area, but it probably belonged to 

 a more ancient formation, from which it had 

 been transported. The microscopic appear- 

 ance of this interesting species was well de- 

 scribed and fairly well figured by Lesquereux, 

 and the internal structure has been admirably 

 worked out by Count Solms, to whom the 

 cutting and study of the specimen was sub- 

 mitted. It is mentioned further by G. R. 

 Wieland in his work on American fossil 

 cycads. 49 



Occurrence: Laramie formation (?), near 

 Golden, Colo. 



Class ANGIOSPERMAE. 



Subclass MONOCOTYLEDONAE. 



Order GRAMINALES. 



Family CYPERACEAE? 



Cyperacites? hillsii Knowlton, n. sp. 



Plate XX, figure 6. 



Cyperacites? hillsii Knowlton [nomen nudum], IT. S. Geol. 

 Survey Bull. 696, p. 222, 1919. 



Leaves flat, without keel; nerves numerous, 

 parallel, 5 millimeters apart, with a single more 



« Carnegie Inst. Washington Pub. 34, vol. 2, p. 109, pi. 1, figi. 1, 2, 101.0. 



