NO. 2256. FOSSIL PLANTS FROM OKLAHOMA— BERRY. 633 



is particularly prominent in the Miocene, no less than 30 species of 

 this age having been described from Europe, Asia, and North 

 America. The genus is present in the Miocene of the United States 

 in Oregon, Colorado, and the Yellowstone Park. The existing species 

 number about two score and are widely distributed throughout the 

 tropics of both hemispheres and are especially abundant in the 

 Asiatic region. Several extend long distances into the North Tem- 

 perate Zone. Three of these are found in the United States— two 

 in Florida and Sapindus drwnmwndi Hooker and Arnott as a con- 

 siderable tree in moist clayey and dry calcareous soils ranges from 

 western Louisiana to southern Kansas and through Texas to the 

 mountain valleys of southern Arizona and northern Mexico. It 

 occurs in the Wichita Mountains of Oklahoma, but I do not know 

 of its presence in Beaver County, although it may occur there. 

 Cotypes.— Cat. Nos 35286, 35287, U.S.N.M. 



Order RHAMNALES. 



Family RHAMNACEAE. 

 Genus RHAMNUS Linnaeus. 



RHAMNUS LESQUEREUXI, new species. 



Plate 95, fig. 4. 



Rhamnus notatus Lesqxjeeeux, Cret. and Tert. Flora, p. 189, pi. 38, fig. 15, 

 1883 (not Saporta, 1867). 



Leaves relatively small and very short petioled, ovate in general 

 outline, inclined to be slightly inequilateral. Apex short and obtusely 

 pointed, as is also the base. Margins entire. Texture sub-coriaceous. 

 Length about 3.5 cm. Maximum width, midway between the apex 

 and the base, 2.1 cm. to 2.2 cm. Midrib stout, curved in the material 

 seen, prominent on the lower surface of the leaf. Secondaries six to 

 eight opposite to alternate, mediumly stout and prominent pairs. 

 They diverge from the midrib at angles of over 45 degrees, are sub- 

 parallel with the lower lateral margins and with one another, and are 

 camptodrome in the maginal region. The areolation is not visible 

 in the Oklahoma specimens. Lesquereux says of the Florissant mate- 

 rial, "nervilles oblique, transversely reticulate." 



This species was provisionally identified by Lesquereux with a 

 form described by Saporta ^ from the Miocene of southeastern 

 France. The latter i« obviously different, being smaller, more cori- 

 aceous, subdentate apicad, and with fewer secondaries. It is, how- 

 ever, similar in appearance, and the two are possibly closely related. 

 The material from Oklahoma appears certainly identical with that 



1 Saporta, G. de, Etudes, vol. 3, 1867, p. 108, pi. 11, fig. 5. 



