154 THE FLORA OF THE DAKOTA GROUP. 



Order ANACARDIACE^. 

 Tribe SPONDIEyE. 



Rhus ! .Westii, sp. uov.' 

 PI. XXXVIII, Figs. 9, 10. 



Leaves lanceolate, acviminate, enlarged and rounded at the base; sec- 

 ondaries parallel, oblique, eamptodrome. 



Two fragments of uncertain relation. The leaves, which taper upward 

 from the rounded base, are ai)parently acuminate, the secondaries being 

 simple, a little curved in traversing the blade, and anastomosing in simple 

 bows quite near the l)orders, diverging from the primary nerve at an angle 

 of 40° to [)0°. 



These fragments appear similar to the leaves of R. cleleta Heer (Fl. 

 Tert. Heh^, vol. 3, p. 83, PI. cxxvii, Fig. 8). But as the lower part of the 

 fragments of the leaves from Kansas is destroyed, their form is uncertain. 

 An appreciable difference is remarked in the more open secondaries of 

 Heer's species. 



Habitat: Ellsworth County, Kansas. Nos. .^)13 and 514 of the museum 

 of the University of Kansas. Collected by E. P. West. 



Rhus Uddeni, sp. uov. 

 PI. LVII, Fig. 2. 



Leaves compound, pinnately divided into coriaceous, opposite, sessile, 

 lanceolate, entire leaflets, the lower deciirring along the main rachis into 

 nari'ow borders or wings; midrib strong; secondaries oblique, numerous, 

 simple, eamptodrome. 



The specimen represents a fraginent of a comi^ound leaf witli three pairs 

 of oi)posite leaflets, attached to a main branch or rachis, winged as seen in its 

 upper part, the wing being mostly erased in the lower part, wlucli is not 

 very well preserved. The upper leaflets are destro}'ed from tlie middle 

 up, but the forking of the midi-ib shows a division of the terminal leaflet 

 into two lobes like that seen in the preceding species. The secondaries, 

 which are 3""" distant at tlie base, emerging from tlie midril) at an angle of 

 30°, are simple, jiarallel, ecpiidistant, very strong, eamptodrome, somewhat 

 curved in passing toward the borders. 



■ This species was named " Rhua ambigua, sp. nov.," by Prof. Lesquerenx, but tliis specific name is 

 already preoccupied by the Rhua ambigua of Unger (Bot. Zeit., 1849, No. 19, p. 352, PI. v, Fig. 9), and 

 I liave changed it to llhiis Weatii in honor of the collector. — F. H. K. 



