MISSOURI MUHLENBERGIAS 1 9 



numerous collections and critical study of several species. Prior 

 to 1905, several of the species now included in the genus MuhlEn- 

 BERGiA, were included in the genus Sporobolus, when Dr. Rydberg' 

 transferred some of the species to this genus. These species seem 

 to me to be intermediate between Muhlenbergia and Sporobolus, 

 and could with equal propriety be included in the genus Sporobolus 

 or in Muhlenbergia, but I leave these species in Muhlenbergia 

 as placed there by Dr. Rydberg. But there is a group of species 

 having single, terminal panicles with flowers on long capillary 

 pedicels, the type of which is SHpa capillaris Lamarck, that seems 

 to m.e to be very distinct from the other species commonly included 

 in the genus Muhlenbergia. This group of species is so distinct 

 from the other species of Muhlenbergia in rootstocks, ligules, 

 panicles, flowers and habit, that I think there is no doubt that 

 they are certainly distinct from that genus. The earliest available 

 name -for this group of species seems to be Podosemum Des- 

 vaux, in Nouv. Bull. Soc. Philom. 2:188. 1810, where the 

 genus is established and Stipa capillaris Lamarck is cited as the. 

 type. The genus is more fully described in Beauvois Agrost. J9, 

 1812. 



I have therefore decided to follow Desvaux in placing some of 

 the species formerly included in the genus Muhlenbergia in the 

 genus Podosemum, but present the single species occurring in the 

 State along with the other species of Muhlenbergia, to which it 

 has generally been referred. 



In this, my presentation of the Missouri species, I differ some- 

 what from the treatment of both Hitchcock and Nash, in the 

 works mentioned above, and have more nearly agreed with Scrilaner 

 in recognizing the species, and have been compelled to describe 

 one new species, being unable to refer the specimens to any de- 

 scribed species. 



I have seen nearly all the Missouri material in existence of the 

 species of Muhlenbergia, through the kindness of Dr. J. M. 

 Green man, curator of the Missouri Botanical Garden Herbarium, 

 Prof. A. S. Hitchcock, Agrostologist in charge of the Grasses 

 in the United States National Museum Herbarium, Prof. Wm. 

 Trelease cf the University of Illinois, Dr. J. A. Nieuwland of the 

 University of Notre Dame, and Mr. Kenneth K. Mackenzie of East 

 Orange, New Jersey, to whom I am under many obligations; 



' Rydberg, Bull. Torr. Club, 32:1905. 



