FLORA OF THK GREEN RIVER GROUP. 145 



DICOTYLEDONES. 



MYRICACEjE. 



MYRICA. 



" U. S. Geol. Rep.," vii, p. 126. 



§ 1. Leaves dentate, serrate or undulate. 



Myrica Copeana, Lesqx. 



Ibid., p. 131, pi. xvii, fig. 5. 



Myrica obscura, ep. nov. 



Plate XXXII, Figs. 8-10. 



Leaves linear-lanceolate, coarsely serrate, rounded in narrowing to the petiole, 

 unequilateral at base; nervation obsolete. 



This form is related by its shape and the teetli of the borders to M. 

 Banktiotfolia, Ung., as figured by Heer, "Fl. Tert. Helv.," pi. c, tigs. 3-10, 

 differing merely by the more rounded and unequilateral base of the leaves 

 and the total disappearance of lateral nerves by immersion into a thick 

 carbonaceous coating. However, fig 6 of Heer represents two leaves 

 without traces of lateral nerves, and fig. 8 has the base somewhat rounded 

 and unequilateral, though not quite as distinctly as in the American form. 

 The pedicel of this last figure is also slender, of the same length as in fig. 

 10, of our plate. The leaves are on an average a little smaller than those 

 of M. Banksiwfolia, 7 to 9 centimeters long and 1 to 2h centimeters broad 

 above the base; the teeth are generally sharp, slightly inclined upward. 



//«&.— Florissant. U. S. Geol. Expl. Dr. F. V. Hayden. 



3Iyrica Ludwigii, Schp. 

 "U. S. Geol. Rep.," vii, p. 133, pi. lxv, fig. 9. 



31 y r i c a acuminata, Ung. 



Ibid., p. 130, pi. xvii, figs. 1-4. 



Myrica rigida, sp. nov. 



Plate XXV, Figs. 3, 4. 



Leaves tbick, rigid, subcoriaceous, lanceolate-acuminate, serrate, rounded and 

 unequilateral at base, short petioled; medial nerve thin, straight, the lateral crasped- 

 odrome. 



This species differs from the preceding by the distinctly lanceolate 



form of the leaves equally and gradually narrowing from the rounded 



base to the apex, by the short petiole, the distinct lateral veins and the 



c p 10 



