DESOUIPTIO^' OF SPECIES. 163 



forking' near the borders, i-raspeduib'omo witli tlieir divisious; iiervillos deep, 

 at right angles to the uerves; areohition small, quadrate, very distinct. 



Though the sha])e and the dimensions of the leaves are variable, the pe- 

 culiar type of nervation remains the same in all the leaves I have seen of 

 this species. The lateral primaries are joined to the median nerve at a short 

 distance above the basal borders of the leaves; the secondaries are compara- 

 tively numerous, consisting of seven pairs, in a leaf a little more than 6""' 

 long, diverging 30" or 40° and forking once or twice quite near the borders. 

 In some specimens the lateral ])rimaries are ramose on the lower side. 



The leaves of this sj)ccies have a degx'ee of relation to those of C. 

 Xininidi and ('. (itUuitivd Ett. (Flora v. Bilin, pt. 3, pp. 3, 4, PI. xl, P"'igs. 

 3- in), at least in the character of the nervation, and especially to Figs. 7 ;uid 

 8 (loc. cit.), but tlie secondaries are less numerous, and though the shape of 

 the leaves is quite variable, none of those figured are comparable tt) that of 

 our plate. 



Habitat: Kansas, [Minnesota, etc. No. 4173 of the collection of IMr. 1\. 

 L). Lacoe. The leaf is similar to that figured from Prof. N. H. Wiuchell's 

 collection. 



CiSSlTES ACEKIFOLIUS, sp. nOV. 



PI. LVIII, Fig. 1. 



Leaf of medium size, thickish, regularly five-lobed and palmateh" fivi'- 

 nervecl from the base, the upper or terminal lobe ovate, blunt })oiiited; 

 upper lateral obli([ue, somewhat long, blunt pointed, the lower shoi-t angu- 

 lar; midrib and upper lateral primaries of medium size branching, the 

 branches curved and cara})todrome, lower primaries, thin, simple. 



The leaf is ovate-cordate in outline, five-nerved from the top of the 

 petiole and five-lobed, the lobes cjuite entire, the lower or basilar ones curv- 

 ing down and rounding lower than the top of the petiole, fonning thus a 

 deejjly emarginate or cordate leaf. 



The median and the upper lateral nerves are stronger and obli(pudy 

 branching, with secondaries oblique, straight or curved; no trace of areola- 

 tion is seen. 



Habitat: Near Fort Harker, Kansas. No. 2750 of the U. S. National 

 Museum. 



