194 UNITED STATES GEOLOGICAL SUllVEY— TERTIARY FLORA. 



Ficus niultiiicrvis, Heer. 



Plate XXVIII, rigs. 7, 8. 



Ficus mulHnerris, UeeT, Fl. Tert. Helv., ii, !>. G3, pi. Issxi, figs. 6-10; Issxii, fig. 1.— Ett., Fosx. Fl. v. 

 Bil., p. 63, pi. XX, figs. 5, 6.— Leeqx., Aunual Report, 1871, p. 300. 



Leaves coriaceous, very entire, elliptical-laneeolate, acuiuinate, gradually or rapidly narrowed to 

 the base ; lateral nerves at an open angle of divergence, very close, parallel, curving close to tbe borders ; 

 areolation very small, quadrangular. 



Considering the form of the leaves of this species, we see it represented in 

 both figs. 7 and 8 of our plate, in coincidence, the first with figs. 7 and 8 of Heer 

 (loc. cit.), and the second with fig. 6, which represents a leaf of about the same 

 size, with the base round-truncate. Except that the secondary nerves are 

 somewhat more oblique to the midrib, generally at least, but not more so than 

 in fig. 7 {loc. cit.), the nervation has the same characters. The secondary 

 nerves, very close, running straight to the borders, are separated by interme- 

 diate tertiary veins, which, though somewhat thinner, are quite discernible 

 even to near the borders. Joined by nervilles in right angle, divided and 

 subdivided in the same manner, the result is an ultimate areolation of very 

 small and quadrangular meshes. This areolation, more distinct upon the 

 American leaves than upon those described by European authors under this 

 name, and also the more oblique divergence of the veins, seem, however, to 

 disagree with the characters of the species, even with those of the genus. 

 Considering these differences, Count Saporta is disposed to refer these leaves 

 to Laurus, or perhaps to Nerium, rather than to Ficus. 



' HABrrAT. — Green River group, with tlie leaves represented in figs. 1-3 

 as Ficus lanceolata {Dr. F. V. Hayden). 



Ficus oblanceolata, Lesqz 



Plate XXVIII, Figs. 9-12. 



Fxcua oblanceolata, Lesqx., Annual Report, 1872, p. 387. — Schp., Pal. Y6g6t., iii, p. 595. 



Leaves subcoriaceous, entire, obovate or obhmccolate, obtusely pointed or acuminate, cuneate to 

 the petiole; secondary veins numerous, parallel, camptodrome. 



The leaves of this species have some likeness to those of F. lanceolata, 

 Heer. Their form is comparatively shorter and broader, and their nerva- 

 tion far more equal, the lateral nerves being close, equidistant, all upon the 

 same angle of divergence of 50°, slightly curved in passing toward the 

 borders and following them in double festoons. The basilar vein only, as 

 seen in fig. 11, is sometimes more oblique. The nerves are deeply cut into 

 the laminae, though not very thick, and the surface is therefore undulate. 

 The nervilles, in right angle to the secondary nerves and quite distinct, give 



