62 ME. Q. BENTHAM ON GEAMINE^. 



seen are H. cenchroides, H. B. K., H. Jamesii (PleurapMs Jamesii, 

 Torr.), S. mutica (FleurapMs mutica, Buckl.), -2". serieea (Pleu- 

 rapMs serieea, Nutt.), and a West-Texan species {WrigM n. 758 

 and 2109, Berlandier n. 168, 1428) very near H. cenchroides, but 

 apparently distinct. 



2. iEaopoGOS", Humb. and Bonpl. {HymenotJiecium, Lag., Schel' 

 lingia, Steud.), extends in two species from Bolivia to Mexico. 

 The genus bas at first sigbt much the aspect of the Asiatic 

 MelanoeencTirus, or of some of the very short-spiked species of 

 Bouteloua, but the real afiinity appears to be with Silaria. The 

 spikelets usually vary from two to six in the cluster, mostly 

 with one hermaphrodite flower in each, though there are usually 

 one or two empty barren spikelets intermixed ; the clusters are 

 in a loose one-sided spike, each one very readily disarticulating 

 from its very short pedicel. 



3. Cathestechus of Presl, a single Mexican species, is only 

 known to me from his figure and description, which do not agree 

 with each other in some important particulars. He says that the 

 genus is allied to Mgopogon. I have no means of judging whether 

 that be really the case. 



4. Anthephoea, Schreb., is a very well-known and perfectly 

 characterized genus of five or six species, of which one is tropical 

 American, the others tropical or Southern African. SypudtBurus, 

 Hochst., quoted by A. Braun in ' Mora,' 1841, p. 275, and by 

 some others, is AnthepJiora abissynioa, Steud. 



5. Teachts, Pers., is a single well-known species from the East- 

 Indian peninsula, several times figured by the earlier botanists of 

 this century. It is slightly anomalous in the tribe by its spikes 

 being two together at the apex of the peduncle, and, as in An- 

 ihepTiora, the excessive hardness of the clusters of spikelets after 

 flowering renders it difiicult to trace their structure unless exa- 

 mined young. The name Trachys was changed by Eeichenbach 

 to Trachyogus, and by Dietrich to Trachystachys, as having been 

 preoccupied by zoologists, a plea not now regarded as sufficient. 



6. Tbagtjs, Hall. (Lappago, Schreb.), is a single annual very 

 well known as a common weed in tropical and temperate regions 

 almost all over the civilized world. 



7. I.ATiPEs, Kunth, is a single tropical- African annual, extend- 

 ing eastward as far as Scinde, very well described and figured by 

 Kunth. It has been united by others with Tragus; but the 

 small spikelets, usually solitary or rarely two together on Iho 



