HITCHCOCK: MEXICAN GRASS 547 



but a large number are still maintained as valid. The plants 

 were deposited at the Bohemian Museum but, when the German 

 University was established, the collections were divided, a part 

 going to each institution. In 1907 the writer found a part of 

 the Haenke grasses at the Bohemian Museum and a part at the 

 German University. The labels on the specimens are meager, 

 usually merely a single word, such as Mexico, Panama, Acapulco, 

 and sometimes even this lacking. There is not always an agree- 

 ment between the label on the specimen and the locality as 

 published by Presl, and in a few cases there is evidence that the 

 labels have been misplaced. 



The grass under consideration was described as Urochloa 

 uniseta. The genus Urochloa was based upon Urochloa pani- 

 coides,^ a species of Panicum from lie de France (Mauritius), 

 referred to later in this article. This species has the spikelets 

 in one-sided spikelike racemes with one or two slender stiff hairs 

 on the pedicel below the spikelets. In Presl's species the spike- 

 lets are in similar one-sided spikes and are subtended by bristles, 

 a single one below each spikelet, these bristles being, however, 

 sterile branchlets instead of hairs or trichomes as in Urochloa 

 panicoides. The locality of U. uniseta as published is merely 

 Mexico. The type specimen, at the German University, is 

 labeled, "Urochloa uniseta Pr. Mexico, H." It is the upper part 

 of a culm bearing three leaves and a panicle of about 20 spikes. 



In 1834 Trinius, in revising the section Setaria of the genus 

 Panicum, remarked that Presl's Urochloa uniseta, which ap- 

 parently he had not seen, probably belonged in Setaria and named 

 it Panicum unisetum. 



In 1862 Schlechtendahl revised Setaria and its allies and es- 

 tablished the genus Ixophorus, basing it upon Urochloa uniseta 

 Presl. He also mentioned a specimen collected by Schiede, 

 which he called I. schiedeana. This species is not described, 

 the author merely saying that it is more delicate and the bristles 

 are thinner and longer. 



In 1886 Fournier, who wrote an account of the grasses of Mex- 

 ico, described a new species of Setaria, which he called 5. cirrhosa, 



2 Beauv. Ess. Agrost. 52. pi. 11. fig. i. 1812. 



