168 THE FLOE A OF THE DAKOTA GEO UP. ' 



frao-ments a long, lanceolate acuminate leaf, diflfering' especially in the bor- 

 ders, which are merely undulate, and the lateral primaries, which are more 

 distant from the midrib and distinctly aerodrome. Z. TJmfcri Heer' and Z. 

 ovafK.s Web.^ are also related to this species. 



Habitat: Ellsworth County, Kansas. Nos. 84, 84a, 730, and 1000 of 

 the museum of the University of Kansas. Collected by A. Wellington and 

 E. P. West. 



Tribe RHAMNE^E. 



Ehamnus similis, sp. uov. 

 PI. XXXV, Figs. 1% 13. 



Leaves coriaceous, entire, lanceolate, gradually narrowed to the base, 

 and more abruptly in the upper i>art to a blunt apex; nervation deeply 

 marked, median nerve strong ; secondaries at an acute angle of divergence, 

 unbent but curving close to the borders, camptodi'ome. 



The leaves are about 9°" long and 3™' Ijroad at the middle, and are 

 thick, with recurved borders; the secondaries are numerous, parallel, 

 equidistant, with few branches, passing straight toward the borders at an_ 

 angle of divergence of 30°, and curve abruptly along them, with close, 

 broken nervilles at right angles. The leaves are much like those of II. 

 rcdinervis Heer,^ merely diifering in the borders being entire, the coriaceous 

 texture with the secondaries less distant and thus more numerous. They 

 have also a marked affinity to those of the liAang Frangula carolinimia Gray, 

 by their" form and by the recurved borders; and still, by the closeness of 

 the secondaries, to those of ^. Purshlanm DC. A degree of relation is also 

 remarked with what Dunker has published in Palaeontographica, vol. 4, 

 1859, p. 182, PI. XXXIV, Fig. 3, as Cytisus cretuceus, a species with leaves of 

 the same size and form as that of Fig. 12, with secondaries close, parallel, 

 but curved in passing toward the borders. 



Habitat: Ellsworth County, Kansas. Nos. 209 and 210 of the collec- 

 tion of Mr. R. D. Lacoe. 



I Fl. Tert. Heir., vol. 3, PI. cxxii, Figs. 25, 25b. 

 ■^Palaeoutogr., vol. G, p. 141, I'l. i.viii. Fig. 13. 

 'Fl. Tert. Helv., vol. 3, p. 80, I'l. cxxv, Figs. 3-6. 



