62 MR. G. BENTHAM ON GRAMINER. 
seen are H. cenchroides, H. B. K., H. Jamesii (Pleuraphis Jamesii, 
Torr.), ZT. mutica (Pleuraphis mutica, Buckl.), H. sericea (Pleu- 
raphis sericea, Nutt.), and a West-Texan species (Wright n. 758 
and 2109, Berlandier n. 168, 1428) very near H. cenchroides, but 
apparently distinct. 
2. /Eaoroaox, Humb. and Bonpl. ( Hymenothecium, Lag., Schel- 
lingia, Steud.), extends in two species from Bolivia to Mexico. 
The genus has at first sight much the aspect of the Asiatic 
Melanocenchrus, or of some of the very short-spiked species of 
Bouteloua, but the real affinity appears to be with Hilaria. 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. 
8. CaruEsTECHUS 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 ZEgopogon. Ihave no means of judging whether 
that be really the case. 
4. ANTHEPHORA, 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. Hypudeurus, 
Hochst., quoted by A. Braun in * Flora, 1841, p. 275, and by 
some others, is Anthephora abissynica, Steud. 
5. Tracuys, Pers., is a single well-known species from the East- 
Indian peninsula, several times figured by the earlier botanists of 
this century. Itis slightly anomalous in the tribe by its spikes 
being two together at the apex of the peduncle, and, as in An- 
thephora, the excessive hardness of the clusters of spikelets after 
flowering renders it difficult to trace their structure unless exa- 
mined young. The name Trachys was changed by Reichenbach 
to Trachyozus, and by Dietrich to Trachystachys, as having been 
preoccupied by zoologists, a plea not now regarded as sufficient. 
6. Tracus, 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. Tarres, 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 ihe 
