136 CONTRIBUTIONS FEOM THE NATIONAL HERBARIUM. 



siliensis.« Swartz's specific name can not be taken up on account of Paspalum 

 polystachyum R. Br.b 



Leersia monandra Sw. Prod. 21. 1788. 



No specimens of Leersia could be found that were types or in any way authentic. 

 This species and the following are probably correctly understood. This species is 

 now called Homalocenchrus monandrus (Sw.) Kuntze. 



Leersia hexandra Sw. Prod. 21. 1788.- 



This is now Homalocenchrus hexandrus (Sw.) Kuntze. . . 



Leersia oryzoides Sw. Prod. 21. 1788. 



This is based on Phalaris oryzoides L., now called Homalocenchrus oryzoides (L.) 

 Poll. 



Paspalum conjugatum Berg. 



This is included by Swartz in his Prodromus (page 21). No specimen of it was 

 found in the Stockholm herbarium, but there is at Madrid a specimen sent by Swartz 

 which belongs to this species as usually understood. 



Paspalum vaginatum Sw. Prod. 21. 1788. 



There are two Swartz specimens, on one of which is the name in the handwriting 

 of Swartz, but both are said to have come from Mauritius. They show the characters 

 that distinguish this species, as described in Small's Flora, from P. distichum L. The 

 spikes are widely spreading or deflexed, the sheaths inflated, the spikelets smooth, 

 the midnorvo of the glume on the convex side suppressed. On one specimen the 

 spikelets are 2.5 mm. long, on the other they are 4 mm. long. No specimen from 

 Jamaica was found that appeared to be authentic. In the Copenhagen herbarium is 

 a specimen sent by Swartz to Vahl which is without locality but is labeled Paspalum 

 vaginatum. This has pubescent spikelets and corresponds to P. distichum. 



Paspalum nliforme Sw. Prod. 22. 1788. 



No specimen of this could be found in the Swartz herbarium. At Munich there 

 are two sheets sent by Swartz labeled P. filiforme. One is Paspalum (Paspalus) 

 caespitn.su m Fliigge and the other isSyntherisma setosa (Desv.) Nash.c Neither of these 

 corresponds to the description of Swartz, which, as amplified in his Flora, d is sufficient 

 to identify the species. It is the species described under this name in Grisebach's 

 Flora. Fliigge changed the name to Paspalus swartzianus because of his own Paspalus 

 jilifarmis (L.) Fliigge based on Panicum filiforme L., e but Swartz's name is valid. 



Paspalum decumbens Sw. Prod. 22. 1788. 



There is a specimen in the Stockholm herbarium and also specimens in the herbaria 

 of Berlin and Delessert sent by Swartz. All are the species as generally understood. 

 This has been called Paspalum pedunculatum Poir.,/ which name must be used on 

 account of Paspalum decumbens Rottb. 1778. Panicum decumbens Roem. & Schult.0 

 is based upon Swartz's species. Fournier has referred this to his genus Dimorpho- 

 stachys, h but the presence of an outer glume is too variable a character to be used as the 

 basis for separating this group as a genus. 



«2'-': 92. 1877. 



bProd. Fl. Nov. Hoi. 188. 1810. 



c See Milium digitatum Sw., p. 142 below. 



<*F1. Ind. Occ. 1: 136. 1797. 



« Fliigge, Mon. Pasp. 96. 1810. 



/Encycl. Suppl. 4: 315. 1816. 



gSyst. 2: 429. 1817. 



AD. pedunculata (Poir.) Fourn. Mex. PI. 2: 15. 1886. 



