DESCRIPTIONS OF SPECIES. 117 



SAPINDUS (?) MEMBRANACEUS Newb. 

 PL XXX, figs. 2, 3. 



Sapindus membranaceus Newb. Ann. X. Y. Lye. Nat. Hist., Vol. IX (April, 1868), 

 p. 52 ; Ills. Cret. and Tert. PI. (1878), PI. XXIV, figs. 2, 3. 



"Leaves pinnate in many pairs of leaflets, and terminating- in a large 

 ovate, often unsymmetrical one; lateral leaflets lanceolate, acute, wedge- 

 shaped at base, unsymmetrical, thin and membranous, with entire 

 margins; nervation fine and sparse, man)- pairs of lateral nerves being 

 given off by the midrib (from which also spring many small lateral 

 branchlets), and these arching upward inosculate near the margin or 

 die out." 



Collected by Dr. F. V. Hayden. 



This is similar in nervation and in the general form of the lateral 

 leaflets to the preceding species (S. affinis), but the whole plant is more 

 delicate, the leaf thinner, the nervation finer, the terminal leaflet several 

 times as large and of a different form. 



Formation and locality: Tertiary (Fort Union group). Fort Union, 

 Dakota. 



Order RHAMNACEiiE. 



Ehajinus elegans Newb. 

 PI. L, fig. 2. 

 Ann. N. Y. Lye. Nat. Hist., Vol. IX (April, 186S), p. -49. 



"Leaves lanceolate, entire, rounded or abruptly narrowed at the base, 

 long-pointed and acute above, broadest part one-third the distance from the 

 base to apex; nervation regular and sharp, but delicate ; midrib strongly 

 marked, lateral nerves twelve to fifteen, nearly equidistant on either side, 

 gently arched upward, and terminating in the margins; tertiary nerves 

 numerous, fine, spanning the distance between the branch nerves, and 

 dividing this space into narrow, sub-rectangular areoles." 



Collected by Miss Kate Haymaker. 



This is a remarkably neat and symmetrical leaf, both as regards its 

 outline and nervation. Its lines are all graceful, with little of the rigidity 

 that characterizes the leaves of most of the Rhamnacese, and more of the 

 aspect of the leaf of a Lauraceous tree: but the numerous parallel side- 



