266 UXITED STATES GEOLOGICAL SURVEY— TERTIARY FLORA. 



migusiifolivs described above, and still more, on actuiint oT the petiole, to S. 



falcifoUus, Heer (Joe. cit.), greatly differing from both Uy its elose, numerous, 



straight lateral nerves, which curve so ahruptlv 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- 



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



angustifolhis, but not coriaceous. 



Habitat. — Upper Green Kiver group, near the mouth ol' White River, 



Utah {Prof. W. Denton). 



^inpiiadus o b I ii si f ol i ii s, Lesqx. 



Plate XLIX, Figs. 8-11. 



Sapindus obtusi/oUiis, 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 (ho 

 laminas; nervilles in right angle, distinct. 



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

 nine, even ten, centimeters long; for 1 have fragments indicating fully this 

 size, being generally hall" 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 

 proportion, 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 a|)parently a 

 distant relation to S. membranaceus, Newby. (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 tiiis locality filled with leaflets of this 

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

 could find there no other species. Mr. Wm. Cleburn, who visited later the 

 same locality, has, among numerous specimens of tiiese two species, one 

 fragment of Carpinus grandi^. 



