DESCKIPTION OF SPECIES— SAPINDACE^. 263 , 



are snmll, the largest seen measuring eight centimeters between the points 

 of tlie lateral lobes, and the same (Vom the top of the long slender petiole 

 to the point of the middle. Their consistence, though somewhat thick, is 

 not coriaceous; they arc generally rounded or truncate to the petiole, and 

 marked all around the borders by short equal teeth, generally turning 

 upward; the lateral lobes are short, acute, or with a short acumen, all diverg- 

 ing 30° to 40° from the midrib, and half as long as the middle. The 

 reUition of these leaves is with Acer vUifolium, Al. ]3r., a very rare species 

 of Oeningen, not yet satisfactorily known and characterized. Comparable 

 also with those figured as A. trilobatum by Ludwig {loc. clt, pi. lii, figs. 

 4-6), they differ essentially by shorter, broader lol)es. From the species 

 as represented by California specimens, this one difibrs also somewhat l)y 

 the less distant, smaller, less acute teeth, and thns seems a transitional form 

 between the Pliocene species and the European Miocene A. tnlohatum. 

 Fig. 3 of our plate is merely a longer, more tapering, middle lobe. It was 

 found with a third incomplete fragment of another leaf, like fig. 1, at the 

 same locality of the Green River group, a formation intermediate between 

 the Carbon Miocene and the Gold Gravel Pliocene. 



Habitat. Near the confluence of White and Green Rivers, Utah, with 



Planera hngifolia, Sapindus Dentoni, Mtjrica acuminata, etc. {Prof. Wm. 



Denton). 



SAPINDACEJ^l. 



SAPINDUS, Linn. 

 The genus has in the present flora few species, most of them distributed 

 over the tropical regions of the globe. One species still inhabits the Southern 

 United States. The geological records refer the origin of the genus to an 

 older period than that ^i Acer; at least, one of our species is described from 

 the Eocene of Golden and Black Buttcs. It is there extremely rare. From 

 Carbon group, we have one also. It is abundantly represented in the Green 

 River group, not only by comparatively numerous I'orms, but by a jn-olu- 

 sion of specimens. Prof. Newberry has described two species of Sapindus 

 from the Miocene of Fort Union and of the Yellowstone Eignitic. In Europe, 

 twenty -one species of this genus are known, all Miocene, except a very rare 

 one described by Saporta from the Armissan. Its absence from the Pliocene 

 of California may explain its nearly total disappearance from the present 

 flora of North America. 



