202 



Trans. Acad. Set. of St. Louis. 



in this species. In C. Marylandica one of the large stamens 

 was partially petaloid. 



It is of interest to note that in the genus Monochoria of 

 the Pontederiaceae in which the general form of the flower 

 resembles somewhat some of the species of Solanum, the 

 Australian species M. cyanea Miill. has the stamens equal 

 and the lower one not produced as in the other two species of 

 the genus, but according to Bentham (Fl. Austral. 7: 72) 

 one anther is often larger or smaller than the others. In 

 the other two species the lower stamen is the larger, with 



Monochoria hastata. — Roxburgh. 



a longer stouter filament provided with a lateral spur. As a 

 possible origin for the lateral spur attention may be called 

 to the description and figures given by Roxburgh * in which he 

 states that in M. vaginalis the lower filament is usually broad 

 and two-cleft, the inferior division bearing the anthers, the 

 other nothing, and in M. hastata the anther of the lower 

 stamen is much larger or double while the filament is two 

 cleft or double. 



Issued December 12, 1903. 



* Eoxburgh, Coromandel^Plauts. 2, pi. 110, 111. 



