180 Trans. Acad. Sci. of St. Louis. 



exception of the apex, but enough is shown to indicate the 

 acuminate nature. 



The blade was probably 7.5-8.5 centimeters long, and has 

 a width of 45 centimeters at the broadest portion near the 

 base. The petiole is nearly 6 centimeters long. In the figures 

 and description given by Lesquereux, the base curves slightly 

 downward to the petiole. The present leaf is distinctly cordate. 

 The secondary nerves alternate and are confluent to the mid- 

 rib. They pass to the borders in gentle curves and anasto- 

 mose in simple bows. Their angle of divergence is 40-50 

 degrees. The leaf has the form of a Populus but the vena- 

 tion is that of a Ficits. The description which Lesquereux 

 gives was from a single specimen, and, even if the specimen 

 here figured has a cordate base, the other characters are in 

 favor of F. Haydenii. The specimen submitted to Les- 

 quereux is from Black Buttes, Wyoming, and the species is 

 considered very rare. 



MALVACEAE. 



Sterculia. 



4. Sterculia Engleri, sp. nov. (Plate XIV. fig. 3). 



Leaf coriaceous, comparatively large, palmately trilobate, 

 triple-nerved; lobes cut nearly to the base, linear-oblong, 

 entire, apparently acuminate; the middle lobe narrower than 

 the lateral ; base rounded ; primary nerves distinct. 



The specimen is a fragment, the upper portions of the 

 lobes having been destroyed. The lateral lobes are 10 to 13 

 millimeters broad and the central lobe a little more than half 

 as wide. Their apparent length was 7 or 8 centimeters. The 

 lobes are almost straight and slightly narrowed toward the 

 base which is rounded and decurrent to a thick petiole. 

 The primary nerves, diverging at an angle of about 40°, arise 

 from the top of the petiole. The secondary nerves are not 

 visible. Only one other species has been found at Florissant. 

 By the facies of this leaf, it might be compared with 8. 

 Labrusca.Vng. The main points of difference are, however, 

 that the middle lobe of this leaf is the narrowest and that the 

 lateral lobes are more nearly straight and longer than those of 



