130 THE I'LOKA OF THE DAKOTA GEOUP. 



XXXII, Fig-. 12) (lill'ers by its smaller size, the secondaries being less iiuiuer- 

 oiis, at a more acute angle of divergence with few branches, and a different 

 general as])ect. The reference, however, of all these leaves to Hedera is 

 authdriziMl l)y their affinity to species of the genus; in nervation, to H. Helix 

 L., in the form of the leaves and characters of the secondary nervation and 

 areolation to H. cuneifolia from Cuba, and especially to H. Guudkhaudi Grra}', 

 of the Spanish Islands. 



Habitat: Ellsworth County, Kansas. No. 824 of the collection of the 

 museum of the University of Kansas. Collected by E. P. West. . 



Hedeka decuerens, sp. uov. 

 PI. XVIII, Fig. 6. 



Leaves subcoriaceous, small, subcordate, oblong-ovate,, obtuse, entire, 

 declining at base and decurring along the short petiole ; nervation tritid from 

 the top of the petiole ; lateral primaries much branching ; the secondaries at a 

 great distance above the primaries, consisting of three })ai'allel pairs, arched 

 and forking uear the borders, subcraspedodrome, vanishing in reaching the 

 1 )orders. 



The leaf is 33°"" long and as broad above the rounded base; the i)ri- 

 mary and secondary nerves at the same angle of divergence of 45°; the 

 lower pair of secondaries tlu'ee times as distant from the i)rimaries as from 

 the upper secondaries above, leaving between them a wide space of 17""" 

 without nerves, except a short, thin one, marked on one side onh' in the 

 middle of the space. 



The species is comparable to H. platanoidea Lesq. (Cret. and Tert. FL, 

 p. 65, PI. II, Figs. 5, 6), and is still more closely related in form and nerva- 

 tion to H. tturkidata Heer (Fl. Foss. Alask., p. 36, PI. ix, Fig. 6), from Avliich 

 it differs especially by the absence of a basilar marginal nerve and in the 

 nervation being less distinctly cam})todrome. This leaf is also comparable 

 to that of Myrs'ute antiqua Ung. (Syll., pt. 3, p. 20, PI. vii. Fig. 7), the form 

 of the leaf with the winged petiole being the same, but the nerves of our 

 species are more curved and distinctly camptodi'ome. 



The decuiTent base of the petiole is not seen in any of the species 

 above quoted. 



Habitat: I'en miles northeast of Delphos, Kansas. No. 4(»31 of the 

 collection of Mr. II. 1). Lacoe. 



