DESCRIPTION OF SPECIES. 171 



alls Heer (Phyll. Cvt't. du Nt'br., p. IG, PI. iii, Fi^-. 1), may l)e mentioned, 

 althouyli it is rather distant. 



Hiil)itiit : Klls\Aortli Comity, Kansas. Nos. 489, 502 and 580 of the 

 collec-tion of the musemn of tlie University of Kansas. Collected by E. 

 P. West. 



Rhamnus revoluta, sp. nov. 

 PI. LXV, Fig. 5. 



Leaf snbcoriaceons, lanceolate, enlarged above the base, rounded to 

 the petiole; borders revolnte to near the obtuse apex, entire; median nerve 

 broad at base, gradually narrowed to tlie apex, where it is nearlv efl^"aced; 

 secondaries olilique, strong, entire or rarely forking, straight in passing to 

 the borders, camptodrome. 



The leaf, which is 6"" long and 1.5*"° broad above tlie base, has nine or 

 ten pairs of secondaries, all jiarallel, ecjuidistant, at an angle of divergence 

 of 40° from the midrib, which passes to a strong, flat petiole, which is broken 

 quite near its point of vmion to the leaf. This species has no distinct rela- 

 tion to any other species of Rhamnus, except by its nervation. 



The revolnte borders do not allow a satisfactory exaniination of its 

 original form. 



Habitat: l*robably ten miles nortlieast of Delphos, Kansas. No. 4175, 

 of the collection of Mr. R. D. Lacoe. 



Rhamnites apiculattjs, sp. nov. 

 PI. XXXVII, Figs. 8-13. 



Leaves small, coriaceous, short petioled, entire, ovate, obovate or ellip- 

 tical, rounded at apex to an apiculate point; primary nerve narrow, second- 

 aries thin, camptodrome, curving to and along the borders. 



The general facies and characters of these leaves seem at first sio-ht to 

 be the same as in the preceding. They diiler, however, in tlie more or less 

 narrowly attenuated base, either acutely or liroadly cuiieifoi-m, in the 

 rounded apex, tipped by a minute point or mucro. According to the width 

 of the cuneate base the secondaries ai-e at a moi-e or less acute angle of di- 

 vergence, the lowest pairs lirancliing and anastomosing in areoles along tlie 

 liorders, the upper more open, shorter and jiarallel. The size of the leaves 

 varies little, being from 3'"' to 4"" in lengtli, and from 17™" to 25""" in width, 

 measured either above or below the middle; some of the leaves are obovate, 

 as in Fig. 10; others nearly regularly oval, as in Fig. 12; others still more 

 enlarged above the base and ovate, as in Figs. 8 and 13. 



