Kirchner — The Fossil Flora of Florissant, Colorado. 187 



Another flower, shown at Plate XV. fig. 2, has some of the 

 characteristics of the Convolvulaceae. The corolla, appar- 

 ently funnel-form or campanulate, has a five-sided border 

 divided by slight clefts into five lobes. The sides of the 

 borders are about two centimeters long. The venation has 

 been beautifully preserved. Each lobe has a central straight 

 nerve which passes to the apex. On either side of this 

 are nerves which curve gently from the apex along the 

 entire length of the lobe. Other prominent nerves mark the 

 divisions between the lobes. These nerves before reaching 

 the cleft in the margin generally divide and send branches 

 toward the apices of the lobes on either side. The principal 

 nerves generally anastomose near the margins. The nervilles 

 are at right angles and the areolation is mostly quadrate. 



BIBLIOGRAPHY. 



Balfour, John Hutlon. Introduction to the Study of Palaeon- 

 tological Botany. Edinburgh, 1872. 



von Etting shausen, C. Die Blatt-Skelete der Dikotyle- 

 donen. Wien, 1861. 



von Etting shausen, C. und A. Pokorny. Die Gef&sspflanzen 

 Oesterreichs in Naturselbstdruck. Wien, 1873. 



Geyler, H. Th. Ueber fossile Pflanzen von Borneo. 



Goeppert, H. R. Die Gattungen der Fossilen Pflanzen. 



Hollick, A. Fossil Salvinias. Bull. Torr. Bot. Club. 

 21 : 253. 



Knowlton, F. H. The Flora of the Dakota Group, a posthu- 

 mous work by Leo Lesquereux. (Rept. U. S. Geol. Surv., 

 Powell, 1891). — A Catalogue of the Cretaceous and Terti- 

 ary Plants of North America. (Bull. U. S. Geol. Surv. No. 

 152. 1898). 



Lesquereux, Leo. Fossil Flora. (Rept. U. S. Geol. Surv., 

 Hayden, 1871: 281-373). — Cretaceous Flora. (Ibid. 

 6). — The Tertiary Flora. (Ibid. 7, Part 2. 1878).— 

 The Cretaceous and Tertiary Flora. (Ibid. 8, Part 3. 

 1883). 



