FLORA OF THE DAKOTA GROUP. 65 



HEDERA, Linn. 

 Hetlera oralis, Lesqx. 

 ' l*. S. Geol. Rep.," vi, p. 91, pi. xxv, fig. 3; pi. xxvi, fig. 4. 



He d era Scliimperi, Lesqx. 

 Plate IV, Fig. 7. 

 Havileii's ''Ann. Rep.," 1874, p. 351, pi. vii, fig. 5. 



Leaf sub-reniform, broader than long, rounded at the top, abruptly narrowed or 

 obliquely sub-truncate to the petiole, three nerved from a little above the base; lateral 

 nerves curving and more or less oblique toward the borders, anastomosing by thick 

 liianches and veinlets with the divisions of short distant secondary veins curving 

 along the borders and entering by short veinlets the distant slightly marked denticula- 

 tions of the margins. 



The leaf is coriaceous, 6J centimeters broad and 6 centimeters long 

 without the petiole, which is only 7 millimeters long. As seen on the 

 specimen it appears enlarged to a point of attachment, not very distinct, 

 however. The lateral veins are inclined on one side toward the medial 

 nerves; on the other they rather tend down or toward the borders; the 

 veinlets all nearly at right angles, anastomosing with the divisions of 

 the secondary veins, form an irregular areolation of angular, square, or 

 polygonal meshes. The areolation is of the same character as in the 

 preceding species, and is analogous to that of Greviopsis tremulcefolia and 

 of Cissus ampelopsidea, Sap., and recognizable also in the following species. 



llab. — South of Fort Harker. Clis. Sternberg. 



He d era platauoidea, Lesqs. 

 Plate III, Figs. 5, 6. 

 Hardens "Ann. Rep.," 1874, p. 351, pi. iil, fig. 3. 



Leaf small, broadly ovate, rounded at the top, truncate at base, short petioled, 

 entire, triple-nerved at a short distance above the basal borders of the leaves ; primary 

 nerves craspedodrome. 



The leaves, five to six centimeters in diameter, are about as broad as 

 long; the borders are entire, though somewhat forced outside over the 

 points of the primary nerves and thus very obscurely and obtusely tri- 

 lobate. The lowest branches of the primary lateral nerves follow the bor- 

 ders in festoons along the base of the leaves as in the preceding species, 

 and there is also under the primary nerves a pair of marginal veinlets at 



