THE NORTH AMERICAN SPECIES OF TRIODIA.* 

 B. F. Bush. 



While studying some specimens of Triodia collected in 

 Texas, I was led to examine more closely the species of this 

 genus, and through the kindness of Prof. Wm. Trelease was 

 enabled to study the specimens preserved in the Herbarium 

 of the Missouri Botanical Garden. 



I now present the results of my observations, which are 

 somewhat at variance with the commonly accepted interpre- 

 tation of the species. 



The species have been described under no less than five 

 generic names, four of which must be considered as syn- 

 onyms, one of which must stand for the genus, and these 

 five generic names are: Sieglingia Bernh., Triodia R. Br., 

 Tricuspis Beauv., Uralepis Nutt., and Windsoria Nutt., given 

 in the order of their publication. 



The first name was originally applied to some Old World 

 forms, which are now generally conceded to be distinct from 

 the North American species under consideration ; the second 

 name, Triodia, was given to the genus by Robert Brown in 

 1810, and appears to me to be the only tenable name for the 

 genus, as the third name Tricuspis^ given to the genus by P. 

 Beauvois in 1812, is doubly barred by being a later name, 

 and by being a homonym of the Tricuspis of Persoon, 1807, 

 a genus in the Tiliaceae. Both of Nuttall's names are of a 

 later date, and are therefore not tenable. 



The following arrangement shows the result of my con- 

 clusions : — 



Triodia R. Br. Prodr. Fl. Nov. Hall. 1 : 182. 1810. 



Sieglingia O. Kuntze, Rev. Gen. PI, 2 : 789. 1891, and authors, not Bernh. 

 Syst. Verg. Pfl. Erf. 40. 1800. 



* Presented by title to The Academy of Science of St. Louis, January 6, 

 1902. 



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