84 THE FLORA OF THE DAKOTA GROUP. 



of the cultivated F. cestrifolia Schott, iu Ettiugshausen's Bilin Flora (i)t. 1 , 

 PI. XXIV, Fig. 3). 



Habitat: Ellsworth County, Kansas. No. 755 of the collection of the 

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



FiCUS ? UNDULATA, Sp. DOV. 



PI. XII, Fig. 5. 



Leaves small, subcoriaceous, deltoid, obtuse, round, truncate at base, 

 deeply, regularly undulate; median nerve thick, rigid; secondaries thin, 

 close together, or alternating with shorter intermediate ones, somewhat 

 cvirved in the middle, camptoch'ome, nearly simple. 



The fragment, the only one seen of this cliaracter, is of a comparatively 

 small leaf, 5*"" long, 4'='° broad near the round ti-uncate base, with thin sec- 

 ondaries pai-allel, at an angle of divergence of 40° to 45° from the midrib. 

 These are nearly 5™" distant at their point of attachment to the midrib, but 

 generally separated by short, intermediate nerves of the same thickness as 

 in the leaves of F. atavina Heer, a common species of the Cretaceous of 

 Greenland. 



Til 3 same tjrpe of nervation is also observed in some of the leaves of 

 Populiis Berg(ireyii Heer,' but this last species has the leaves attenuated to 

 the base and quite entire. Therefore the generic relation of this leaf 

 remains somewhat uncertain. 



Habitat : Ellsworth County, Kansas. No. 599 of the museum of the 

 University of Kansas ; E. P. West, collector. 



FiCUS ALIGEKA, Sp. UOV. 



PI. X, Figs. 3-6. 



Leaves subcoriaceous, quite entire, small, ovate or oval, obtuse or 

 obtusely acmninate, rounded, subtruncate or narrowed to the base ; petiole 

 short, alate, constricted at its point of union with the leaves ; nervation 

 pinnate; primary nerve strong, percurrent; secondaries oblique, parallel, 

 equidistant, camptodrorae ; nervilles obsolete, their base appearing at right 

 angles to the secondaries. 



The leaves vary from 2"" to 5""° in length and from 2'^'" to 3""° in width 

 at or below the middle; the secondaries, at an angle of 40° to 50°, number 

 from six to ten pairs, more or less closely placed, cm-ve in traversing the 

 areas, and are mostly simple or Avith very few branches; the petiole, 1.5*"" to 



•Fl. Fose. Arct., vol. 6, 2 Abth., PI. xvii, Fig. 8a. 



