DESCRIPTION OF SPECIES. J 55 



This sj)ecies, like tlie precedino- one, lias a marked analogy with the 

 leaves of E. copdnbta L., the dwarf sumach of tlie northeastern pai-t of the 

 United States, and allied species, especially li. rirois Lindh., the leaves of 

 which are sometimes coriaceous. The form of its sessile, entire leaflets is 

 the same as well as the direction of the numerous secondaries. 



Habitat: Kansas. Specimen presented to the U. S. National Museum 

 by J. A. Udden. 



Rhus Powelliana, sp. nov. 

 PI. LVI, Figs. 4, 5. 



Leaves large, compound, lanceolate, alternately di\'ided into petiolate 

 lanceolate, blunt-pointed leaflets of thin texture, the terminal larger, biloliate 

 from the middle, those of the lower pair also sliort lobate at the ))ase or 

 subdivided into narrower, shorter pinnules; priinarv nerves thick; second- 

 aries simple, numerous, parallel, camptodrome; main rachis round, and like 

 the rachis of the ])innules, not winged. 



The fragments preserved are part of large, compound leaves, the best 

 of wliich, figured here, has three pairs of lateral piimules with the terminal 

 one lobate. The pinnules are oblique, parallel, alternate, 2'™ to ."V" distant, 

 at least J)™' to 11""" long, 2™' to 2.5"'" broad at the middle, with Ix.rders 

 slightly undulate f»r rei)and. The midribs are thick and pass downward 

 into a round petiole of the same thickness, about P™ long, cylindrical, not 

 winged. Tiie secondaries emerge with the same angle of divergence of 30°, 

 and are somewhat cm-ved in passing toward the borders, all being simple. 



'i'he fragment (Fig. 5) is part of a much larger leaf of which onlv the 

 terminal leaflets remain, with the upper ])art of two lateral ones. It has the 

 same character, the terminal leaflet being l)ilobate in the upper part b}' the 

 forking of the midrib near the l)ase. 



This fine species is. related t(» li. jiujlaiKlof/ciic Ktt., as figured by Saporta 

 in Etudes, vol. 2, PI. xiii. Fig. 2b, the leaves of which are, however, sessile 

 and dentate. 



On this last quotation Schimper remarks that tlie leaves appear rather 

 to be those of a Sapindus, espccialh' on account of their entire l)orders. 



Habitat: Near Fort Harker, Kansas. No. 2(591 of the U. S. National 

 Museum. 



