62 THE FLORA OF THE DAKOTA GROUP. 



6. Betulitks Westii var. in^equilateealis. 

 PI. V, Figs. 10-13. 



Leaves very small, more eularged on one side, ol)long', rounded at apex, 

 distinctly denticulate. Nos. 355, 366, 391, and 403 of the collection. 



7. Betulites Westii var. multinervis. 

 PI. IV, Figs. 20-22. 



Leaves ovate-lanceolate or deltoid, obtuse at apex; truncate or broadly 

 cuneate at base ; secondaries eight to ten pairs, boi'ders distinctly denticulate. 

 Nos. 273, 291, and 396 of the collection. 



8. Betulites Westii var. cuneatus. 

 PI. V, Fig. 8. 



Leaves rounded above, cuneiform at the base; secondaries at a more 

 acute angle of divergence (35°), borders denticulate. No. 318 of the col- 

 lection. 



9. Betulites Westii var. reniformis. 

 PI. V, Fig. 5. 



Leaves enlarged in the middle, round above, cordate at base, reniform; 

 borders denticulate. No. 345 of the collection. 



10. Betulites Westii var. rhomboidalis. 

 PI. V, Figs. 6, 7. 



Leaves large, rhomboidal in outline, blunt-pointed, broadly cuneate to 

 the long petiole. Nos. 301 and 304 of the collection. 



11. Betulites Westii var, quadratifolius. 

 PI. V, Fig. 9. 



Leaf 4"" long, 4.5"'° broad, truncate at base and apex, lateral boi'ders 

 nearly parallel; secondaries, five pairs, subopposite, distant, teeth distant, 

 more sharply marked. 



The specimen bears near the base of the petiole a launch of small pedi- 

 celed seeds like those of a Carex. No. 246 of the collection. 



12. Betulites Westii var. lanceolatus. 

 PI, V, Fig. 14. 



Leaves lanceolate, pointed, rounded at base, denticulate : secondaries at 

 an angle of divergence of 30° to 40°. The lower slightly curved back in 

 traversing the blade; ramose. 



