GENERA OF GRASSES OF THE UNITED STATES. 
191 
Chloropsis Hack. ; Kuntze, Rev. Gen. PI. 2 : 771. 1891. The name was men- 
tioned by Hackel 1 as a synonym under Trichloris. Hackel also mentions 
Chloridopsis, both names having been used by gardeners for Trichloris Man- 
chard ion a Hack, of Argentina. Kuntze changes the name Trichloris to Chlor- 
opsis, because of the earlier Trichlora Baker. Both Trichlora and Trichloris 
may be considered valid, since they have different derivations and slightly 
different spellings. Since Kuntze adopts Hackel's name and since Hackel 
mentions Chloropsis blanchardiqna, this species is selected as the type of 
Chloropsis. 
The two species of the United States, Trichloris memdocina (Phil.) 
Kurtz (T. fasciculata Fourn.) (fig. 113) and T. pluriflora Fourn., 
are found in the arid regions of northern Mexico and extend into 
western Texas, southern New 7 Mexico, and southern Arizona. The 
first has spikelets with one perfect floret and a rudiment, each with 
three long aw^ns; the second has spikelets with 3 to 5 florets, the 
upper one or two reduced, the lateral awns reduced or sometimes 
wanting. Neither is of importance agriculturally. 
95. Bouteloua Lag., the grama grasses. 
Spikelets 1-flowered, with the rudiments of one or more florets 
above, sessile, in tw r o rows along one side of the rachis; glumes un- 
equal, 1-nerved, acuminate or awn-tipped, the first shorter and nar- 
rower ; lemma as long as the second glume or a little longer, 3-nerved, 
the nerves extending into short or often rather long awns, the in- 
ternerves usually extending into teeth; palea 2 -nerved, sometimes 
2-awned; rudiment various, usually 3-awned, a second rudimentary 
floret sometimes present. 
Perennial or sometimes annual, low or rather tall grasses, with two 
to several or many spikes racemose on a common axis, or sometimes 
solitary, the spikelets few to many in each spike, rarely solitary, 
pectinate or more loosely arranged and appressed, the rachis of the 
spike usually produced beyond the insertion of the spikelets. Spe- 
cies 38, all American and chiefly North American; 18 species found 
in the United States, mostty in open grassland of the southwestern 
States. 
Type species : Bouteloua racemosa Lag. 
Bouteloua Lag., Varied. Cienc. Lit. and Art. 2 4 : 134. 1805. Lagasca gives 
five species, B. racemosa, B. hirsuta, B. barbata, B. simplex, and B. prostrata. 
All are briefly described, except the last, which is mentioned by name only. The 
first species (which is the same as B. curtipendula) is selected as the type. In 
this work Lagasca spells the name of the genus " Botelua " and states that he 
names the genus in honor of the two brothers Boutelou. In a later work 2 
Lagasca describes the genus under the name Bouteloua, and includes 10 species, 
the first of which is B. hirsuta. The spelling Bouteloua is retained because it 
was corrected to this form by the author to correspond to the spelling of the 
personal name of the brothers Boutelou, and because this second spelling has 
been universally accepted by botanists. 
Atheropogon Muhl. ; Willd., Sp. PI. 4: 937. 1806. A single species is described, 
.t. apludioides Muhl., which is Bouteloua curtipendula. 
Triathera Desv., Nouv. Bull. Soc. Philom. Paris 2: 188. 1810. Based on 
Aristida americana L., which is Bouteloua americana (L.) Scrihn., a West 
Indian species. 
x In Engl, and Prantl, Pflanzenfam. 2 2 : 59. 1887. 
2 Gen. and Sp. Nov. 5. 1816, 
