] 82 THE FLORA OF THE DAKOTA GROUP, 



tion of the secondaries, the h)wer pair of whieh, however, in both species 

 are not so supra-basilar. 



Habitat: Ellsworth County, Kansas. No. 1188 of the collection of 

 Mr. R. D. Lacoe. 



Order STERCULIACE^. 



Tribe STERCULIE^E. 



Stekculta mfcronata, sp. nov. 

 PI. XXX, Figs. 1-4. 



Leaves small, snbcoriaceous, narrowed, subcordate or truncate at base, 

 three to fixe pahnately lobed, three pahnately nerved from the to]j of the peti- 

 ole; lobes entire, lanceolate or narrowed in rounding to a linear obtuse 

 mucro; primary lateral nerves simple or forking near the base; secondaries 

 curved upward, camptodrome. 



The largest of these leaves (Fig. 1) is more than 10*"" broad between 

 the apices of the lateral lobes, and is 6*" long from the top of the petiole to 

 the apex of the median nerve. The lobes diverge 30° to 40°, and like the 

 primary nerves with their divisions, are entire, either rounded above and 

 nan-owed to the mucronate ajjex or lanceolate and tapering upward. The 

 sinuses are broad, the petiole long. The different forms of the leaves are 

 seen in the four figures of the species. Figs. 3 and 4 being merely trilobate, 

 the one rounded toward the apex, the other gradually acuminate. 



The species is especially related by the form and disposition of the 

 lobes to Liqitidamhar intrgnfolhim Lesq. (Cret. Fl., p. 56, PI. ii, Figs. 1-3 ; 

 PI. XXIV, Fig. 2 ; PI. XXIX, Fig. 8). But for the prolongation of the apex 

 into a linear point, these leaves might be referred to this last species, for in 

 Cret. Fl., PI. XXIV, Fig. 2, the camptodi'ome nervation is of the same type, 

 and the lol^es, which are obtuse in Fig. 2, are also sf)metimes lanceolate and 

 l)luut pointed as in oj). cit. (PI. ii. Figs. 2, 3). Tliis indicates for the leaves 

 of Sterculia the same disposition to variability in the Cretaceous as is 

 observed in the species of the Miocene and of the present epoch. 8. car- 

 thaginensis Cav. of the living flora has leaves of analogous characters to 

 those of the species described above. 



Habitat: Ellsworth County, Kansas. Nos. 731, 735, 736, and 741 of 

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



