266 UNITED STATES GEOLOGICAL SURVEY— TEETIARY FLORA. 



angustifolivs described above, and still more, on account of" the peiiole, to S. 

 faldfolivs, Heer {he. cit.), greatly differing from both by its close, numerous, 

 straight lateral nerves, which curve so abruptly near the borders, and follow 

 them so closely, that they seem as entering them. The borders of the leaflets 

 are, however, more or less reflexed, and, when flattened, the successive bows 

 of the veins are distinctly seen. The areolation is the same as in S falci- 

 folivs. The substance of the leaves is somewhat more consistent than in S. 

 anguslifolhis, but not coriaceous. 



Habitat — Upper Green River group, near the mouth of White River, 

 Utah {Prof. W. Denton). 



Kapiiidiis obtiisifoliiis, Lesqx. 

 Plate XLIX, Figs. 8-U. 

 Sapindus obtiisifollus, Lesqx., Annual Report, 1873, p. 419. 



Leaves impari-pinnate ; rachis flat, not winged ; leaflets sessile, ovate, obtnse or obtusely pointed, 

 narrowed in a curve to tbe base, very entire ; lateral veins inequidistant, curving in traversing the 

 laminas; nervilles in rigbt angle, distinct. 



The leaflets are extremely variable in size; from one and a half to 

 nine, even ten, centimeters long; for I have fragments indicating fully this 

 size, being generally half as broad as they are long. This indicates a 

 large number of leaflets for the leaves. The leaflets are about exactly 

 ovate, more or less obtuse, and also enlarged in the upper part in diverse 

 proporfion, some of them being nearly equilateral. The consistence is sub- 

 coriaceous, the surface smooth, undulate, sometimes polished. The lateral 

 veins, on a broad angle of divergence curved in passing to the borders, follow 

 them at a short distance in simple series of bows, casually displaced by the 

 interposition of tertiary, shorter veins, anastomosing to the upper part of the 

 lateral nerves. The nervilles, in right angle to the nerves, are generally dis- 

 tinct, but the areolation is always obsolete. This species has apparently a 

 distant relation to S. membranaceug, Nevvby. (Ext. Fl., p. 52), but none 

 whatever to any of the European fossil congeners. 



Habitat. — Eight miles southeast of Green River Station, Wyoming, 

 in connection with thin beds of coal referable to the Washakie or Car- 

 bon group. A l)ed of shale is at this locality filled with leaflets of this 

 species mixed with fragments of leaves and branches of Miisophyllu77i. I 

 could find there no other species. Mr. Wm. Clehurn., who visited later tlie 

 same locality, lias, among numerous specimens of these two species, one 

 fragment of Carpinus grandis. 



