NATURAL SCIENCES OF PHILADELPHIA. 93 



dowers ; lower glume strongly 3-nerved ; nerves green, or slightly tinged 

 with reddish brown ; the midrib of both glumes is prolonged into bristles, 

 the one exceeding the other 34 lines. 



Aristida filipendula, s. n. Culmo erecto glabro, firmo simplici tereti 

 li 2 pedali ; foliis paucis convolutis 3 8-policaribus vaginis glabris inter- 

 nodio brevioribus ; ligulis breve pilosis ; panicula interrupta 7 9-policari ; 

 radiis capillaribus insequantibus flexuosis longissimis (1 2 policaribus) ; 

 gluinis inaeqnalibus mucronatis, inferiore fiosculo J breviore, superiore 

 riosculum superante ; fiosculo scabro et albo-punctato apice torto ad basin pi- 

 loso ; setis 3 subsequalibus lato divaricatis circum 1| policaribus. 



Western Texas. June. 



Flowers purple and somewhat fascicled on short pedicels near the ends of 

 the filiform branches. 



This is a common species on dry hills, often being found in the vicinity of 

 the dens of the stinging ant. It differs from the A. purpurea of Nutt. in 

 its shorter bristles, scabrous and dotted florets, which are often more or less 

 twisted at the top. It also flowers about two months later, the A. purpurea 

 flowering the last of March and first of April, being then very common and 

 conspicuous on the prairies of Northern Texas, with its purple panicles, with 

 bristles 3 4 inches long, waving in the wind. 



The Aristida longisetaof Steudel is apparently founded on dwarf speci- 

 mens of A. purpurea, judging from specimens collected by Fendler in New 

 Mexico which are in the Herbarium of the Academy. 



Bouteloua p u m i 1 a, s. n. Radice fibrosa; culmis basi ramosis genicu- 

 latis glabris 4 (5-policaribus ; vaginis glabris ; ligula breve membranacea apice 

 multilaciniata ; foliis planis glabris 1 2 policaribus 1 lin. latis ; spicis secundis 

 solitaries breviter pedicellatis 20 30 spiculatis ; spiculis ovatis densis 2 3- 

 floris : gluinis 2 ovatis insequalibus carinatis apice brevisetis ; superiore 

 tlosculum requante ; valvulis hermaphroditis ovatis inferiore tridentata glabra 

 margine ciliata, superiore glabra tridentata basi et apice breviter ciliata ; 

 fiosculo sterili triaristato ; setis hermaphroditam sequantibus. 



Northwestern Texas. 



Growing in tufts on hill sides ; culms slender ; spikes 3 4 on a stem, 

 5 1 inch distant ; florets, including the bristles, about a line in length. 



Bouteloua br e v i fo 1 i a, s. n. Radice fibrosa; culrnis basi numerosis 

 erectis teretibus pilosis geniculatis ; vaginis glabriusculis ; ligulis pilosis ; 

 foliis convolutis aut planis glabris 1 2-policaribus circum 1 lin. latis; spicis 

 secundis breviter pedicellatis ; pedicellis valde pilosis ; rachi compresso parce 

 scabro 10 15 floro ; spiculis bifloris brevissime pedicellatis alternatis con- 

 fertis ; glumis glabris insequalibus, inferiore lineari subulata superiore duplo 

 breviore ; inferiore glabra apice breviter aristata ; fiosculo sterili 3-aristato. 



Northwestern Texas. 



Growing in tufts on dry hill sides ; roots perennial ; bristles of the neutral 

 florets little longer than those of the upper glume ; culms 1 2 feet high ; 

 spikes | 1 inch long ; hairs of the stem white, numerous and suberect. 



Uralepis (Tricuspis) brevicuspidata, s. n. Culmo glabro (3 4-pe- 

 dali) erecto geniculato ; vaginis glabris internodio brevioribus ; ligula brevis- 

 sima laciniata ; foliis scabris 6 12-policaribus 3 4 lin. latis ; panicula pa- 

 tente 8 14 policari long. 4 6 policari lato ; radiis solitariis aut gemi- 

 nis a basi floriferis scabris 4 6-policaribus multispicatis ; spiculis 5 7- 

 floris obovatis distichis breviter pedicellatis ; glumis parum insequalibus 

 carinatis dorso scabris acuminatis flosculis brevioribus ; valvula inferiore tri- 

 nervia apice bifida margine breviter ciliata, medio dente brevissimo aristato ; 

 lateralibus dentibus obtusiusculis scariosis. 



Northern Texas. May. 



1862.] 



