134 THE FLORA OF THE DAKOTA GKOUP. 



forking' a little above it. The lobes are emarginate at apex, entire, short 

 and s('])arate(l by naiTow, obtuse sinuses; the median nerve, which is con- 

 tinued from tlie ])etiole, is 3""" thick, the lateral al)out half as strong-. The 

 secondaries are thick at base, nuich curved in passing to the borders and 

 branch and anastomose near them, either with liranches of those aliove or 

 with long, continuous ner\nlles at right angles to the primaries; the areoles 

 formed by subdivisions at right angles of the nervilles are nearl)' sc^uare, 

 somewhnt large. 



This leaf is as 3"et without recognized affinity, except witli the leaves 

 described in my Cret. Fl., p. ^C, PI. ii. Figs. 1-3; PI. xxiv, Fig. 2; PI. xxix, 

 Fig. 8, as Liquidamhar mtcgrifoUum ,- and especially with the small fragment 

 referred to Sassafras cretaceum Newb., var. ohfusifoliioii Lesq. (loc. cit.), PI. 

 XXIX, Fig. i). P^rom these leaves, however, it differs greatly in the nervation, 

 the primaries being supra-basilar and the secondaries distinctly i-ampto- 

 drome, as in certain species of Aralia. 



Habitat: Three miles south-southeast of Fort Harker, Kansas. No. 

 810 of the Museum of Comparative Zoology of Cambridge, Massiichusetts. 



Aralia grcenlandica Heer. 

 PI. LIV, Figs. 1-3. 



Fl. Foss. Arct., vol. G, 2 Abtb., p. 84, PI. xxxviii, Fig. 3; PI. xxxix, Fig. 1; PI. XLVi, 



Figs. 16, 17. 



Leaves generallv large, coriaceous, with smooth surface, five nerved 

 from the top of the })etiole, generally a little above the basil horders of the 

 leaves, trilobate; l)ase truncate and rounded, declining to the petiole; 

 l(>).)es equal, obtuse or apiculate, entire or sometimes short obtusely lobate; 

 even broadly emarginate at apex, separated by half round, broad sinuses. 



The leaves vary from 7™ to 12"™ in diameter between the apices of the 

 lateral lobes, and from C)""^ to 1(F™ in length froin the top of tJie petiole to 

 the apex of the median lobe; the lateral nerves diverge from the top of the 

 petiole, the lowest thinner, simple or ramose underneath, and curve along 

 the entire borders or enter a .short ol)tuse lol)c; the upper ones are ramose 

 on both sides, have their branches camptoilrome, and are much curved iu 

 following the borders. 



Inhere is some difference in the characters of the leaves referable to 

 this species as compared to those figured by Heer in Fl. Foss. Arct. (loc. 

 (•it.). The form, .size, and texture are alike, but in Heer s figure tlie priuiarv 

 nerves are onlv three in IM. xxxvni, Fig. 3, tlie lateral su|ti-a-1)asilar, tlie 



