FLORA OF THE GREEN RIVER GROUP. 141 



From the fragments preserved the leaves appear to have been very 

 long. Linear in the middle where they are 3 centimeters broad, they are 

 slightly narrower upward and apparently rounded to a pointed apex, 

 gradually tapering downward to the upper part of the root, a small tuber- 

 cle. The medial nerve, quite distinct, is 2 milhmeters broad in the middle. 

 Though related to Cyperus and Cyperites, this leaf has no marked affniity 

 to any one of the numerous forms which have been described under this 

 name. The leaf is quite flat and does not appear to have been keeled in 

 the middle, but distinctly nerved. It comes out directly from the tubercle. 

 The lateral nerves, 12 to 14, are separated by veinlets without any trans- 

 verse veins. 



^a6.— Randolph Co., Colorado. U., S. Geol. Expl. Dr. F. V. Hayden. 



ARUNDO, Linn. 

 Ariindo Goepperti ?, Miinst. 

 " U. S. Geol. Rep," -m, p. 86, pi. viii, figs. 3-5. 



Arundo reperta, Lesqx. 



Ibid., p. 87, pi. viii, figs. 6, 8. 



Ibid., pi. viii, figs. 10-13. 



PHRAGMITES, Trin. 

 Pliragmites Alaskana, Heer. 



TYPHACE^. 



TYPHA. 

 Typha latissinia, Al. Br. 



Plate XXIII, Figs. 4, 4o. 



Al. Br., "Stizenb. Verz.," p. 75; Heer, " Fl. Tert, Helv.," i, p. 98, pi. xliii, xliv; "Mioc. Bait. Fl.," p.29, pi. iv, 

 fig. 11 ; Ett., "Foss. Fl. v. Bilin," p. 30, pi. vi, fig. 9. 



Leaves very long, 2 to 3 centimeters broad, linear, marked lengthwise by parallel 

 strong nerves (14) crossed at right angles by transverse thin lines; intermedial veinlets 

 numerous (10-13). 



Though these fragments, which are numerous, and part of which only 

 are figured, are referable to the European species by their appearance, they 

 may represent a different one on account of the numerous intermediate 

 veinlets which separate the primary nerves. In the European species only 

 4 to 6 are counted, while on the American specimens they are generally 

 10 to 12. It is, however, to be remarked that Typha species living at the 



