NATURAL SCIENCES OF PHILADELPHIA. 99 



glabris, superioribus marginibus et faucibus parce villosis ; ligulis 2 3 lin. 

 Ion. apice laciniatis ; foliis glanis pubescentibus margine ciliatis 4 6 policari- 

 bus 3 4 lin. latis ; panicula diifusa composita 6 8 policari 4 5 polic. latis ; 

 radiis 5 7-nis basi nudis hirsutis ad apiceni compositis ; ramulis 3 4 nis, 

 unispicatis ; spiculis 4 5-floris oblongo-obovatis ; glumis parum insequalibns 

 carinatis lineari-lanceolatis ciliatis acuminatis, marginibus apicibusque albo- 

 hyalinis, superiore 3 5-nervia ; valvula inferiore lanceolata 5 7-nervia ciliata 

 apice bifida et aristata ; seta 6 lin. Ion. 



Northern Texas. 



The longest of the lower branches of the panicle 3 4 inches in length, and 

 the shorter branches 1 2 inches long, all destitute of spikes excepting near 

 their tops ; spikes loosely flowered ; internodes on the rachis 1 2 inches long ; 

 pedicels 4 6 lines in length ; spikes without the bristle about an inch long, 

 loosely flowered ; upper florets abortive, 2 3 united, appearing to the naked 

 eye like one with 23 bristles. 



Uniola (Brizopyrum) flexuosa, s. n. Culmis erectis gracilentibus glab- 

 ris 1J 2 pedalibus ; vaginis glabris internodio brevioribus ore parum pilosis 

 vel nudis ; ligula nulla ; foliis planis glabris 4 6 policaribus et 1 3 liu. latis ; 

 panicula terminali conferta 23 policari, 6 10 lin. latis, 15 20 spicatis ; 

 spiculis 10 12-floris oblongo-ovatis acutis 68 lin. Ion. et 2 3 lin. latis ; 

 glumis insequalibus ovatis obscure 3-nerviis seu glabris acutis ; valvula infe- 

 riore obscure nervata glabra subacuta ; superiore bicarinata apice obtusa aut 

 truncata. 



On the Brazos at Fort Belknap. 



Culms weak, smaller at the base than above ; leaves of the stem 22^ 

 inches distant, not rigid ; roots fibrous and small. 



Elymus interruptus, s. n. Culmo tereti simplici glabro erecto 2 3 

 pedali ; vaginis glabris marginibus breviter ciliatis ; ligula brevissima mem- 

 branacea laciniata ; foliis planis scabriusculis 6 8 policaribus, 3 4 lin. latis ; 

 spica pauciflora interrupta 3 5-policari ; spiculis geminatis 3 4-floris laxis ; 

 glumis setaceis flosculum superantibus ; valvula inferiore 5-nervia glabra in 

 aristam terminata ; arista arcuata scabra valvula duplo longiore ; valvula su- 

 periore integerima, apice et margine breviter ciliata. 



Llano County, Texas. Internodes on the rachis about ^ an inch long ; flo- 

 rets about the same length ; bristles of the palea an inch in length, those of 

 the glume nearly eight lines long ; rachis angular or compressed, smooth, or 

 a little scabrous on the margins. 



Elymus triticoides, s. n. Culmo geniculato glabro (1 2 pedali) ; va- 

 ginis glabris vel parum pilosis ; ligula brevissima laciniata ; foliis convolutis 

 aut planis (2 3 policari) pubescentibus ; spica stricta lh 2 policari ; spicu- 

 lis solitariis aut geminis 23 floris racheos internodium superantibus ; glumis 

 subulatis marginibus scabris vel brevissime setosis ; valvula inferiore enervia 

 seu obscure 5-nervia glabra apice breviter aristata ; valvula superiore sub- 

 sequali obtusa apice et margine pubescente obscure 2-nervia. 



Rocky Mountains. Nuttall. 



Rachis slightly rough ; bristles of the palea 2 3 lines long ; glumes shorter 

 than the valves. 



Elymus g 1 a u c u s, s. n. Culmo basi glabro ad apicem parum scabro 1 2 

 pedali ; vaginis parce scabris internodium superantibus ; ligula membranacea 

 truncata parum fissa ; foliis planis glabriusculis 4 8 policaribus 2 3 lin. 

 lat. ; spica 2 3 policar. 3 4 lin. lat. ; spiculis 2 3-floris adpressis ; glumis 

 flosculis parum brevioribus aut requantibus 3 5-nervis lineari-lanceolatis 

 subulatis ; valvula inferiore convoluta glabra obscure nervata vel enervia 

 apice pubescente ; setis scabris valvula 2 3-plo longioribus. 



Columbia river. Nuttall. 



1862.] 



