HITCHCOCK: MEXICAN GRASS 551 



GuaTEmaIvA: Patulul, Heyde & Lux 6401. 



Salvador: San Salvador, Renson 301, 362. Sonsonate, Hitch- 

 cock 8977. 



Nicaragua: Corinto, Hitchcock 8614. Realejo, Hitchcock 

 8750. 



Costa Rica: Guadelupe, Tonduz 14480 (cultivated). 



In a preceding paragraph it was stated that the genus Urochloa, 

 to which Ixophorus unisetus was first referred, was based upon a 

 single species, U. panicoides Beauv. (1812). A few years later 

 (18 1 6) Poiret described the same species as Panicum javanicum. 

 In 1 82 1 Trinius, in an article entitled Agrostographische Beyirdge,* 

 published an allied species from the East Indies, as Panicum 

 helopus. Later authors confused the two species and Hooker 

 in his Flora of British India unites them under the name P. 

 javanicum. This author, who is much given to placing under 

 one name several allied species, makes the following statement 

 under P. javanicum: "Kunth (Revis. Gram. i. 206) says, 

 under Urochloa panicoides, that he has examined in Desfontaine's 

 Herbarium the type of Poiret's P. javanicum, and identified it, 

 which he cites as a syn. of Urochloa panicoides, but his figure 

 of which again quite accords with a narrow-leaved form of P. 

 helopus, Trin. This requires the adoption of the name javanicum 

 (by misprint japonicum in Kunth Revis.) for the species. Bent- 

 ham, on the other hand {Fl. Austral., vii 477), says that Munro 

 has seen an authentic specimen of javanicum, and that it is quite 

 distinct from P. helopus. I have no means of verifying either 

 authority." The original description of P. javanicum states that 

 the spikelets are glabrous; the original description of P. helopus 

 states that the spikelets are hirsute. Beauvois's figure, accom- 

 panying the original description of Urochloa panicoides, shows the 

 spikelets to be glabrous. Thus one can easily distinguish the 

 two species without consulting the evidence of which Hooker 

 speaks. 



The species with glabrous spikelets should be known as Pani- 

 cum panicoides (Beauv.) Hitchc. {Urochloa panicoides Beauv. 

 Ess. Agrost. 52. pi. II. fig. I. 181 2; Panictim javanicum 

 Poir. in Lam. Encycl. Suppl. 4: 274. 18 16). 



3 Spreng. Neu. Rntd. 2: 84. 1821. 



