88 PROCEEDINGS OP THE ACADEMY OP 



The following species cannot be properly identified from the descriptions 

 given : 



T. americana Kirby, N. Z. 166. 



T. subnigra Beauv., Ins. 127, tab. 32, fig. 9. 



T. depressior " " 126, " fig. 7. 



T. marginata " " 125, " fig. 3. 



The marginata of Beauv. may be an immature form of n ana Mels. ; d e- 

 p r e s s i o r may be mauritanica Linn. The catalogue of Dejean contains 

 many species named from North America ; as no descriptions have ever been 

 given of the greater part of them, their synonymy cannot be determined. 



Trogonta p u s i I 1 i m a Mann. Bull. Mosc. 1843, 302, does not belong to the 

 genus ; it is, however, unknown to me. 



Descriptions of PLANTS. No. 3. 

 BY S. B. BUCKLEY. 



GrAMINE/E. 



Polypogon alopecuroid.es, s. n. Radice fibrosa ; culmo erecto (6 8 

 policar.) glabro ; vaginis glabris ; ligulis elongatis (3 4 lin.) membranaceis 

 integerrimis vel tarde fissis ; foliis planis glabris (24 policar.); panicula 

 terminali (1^2 policar. Ion. 3 4 lin. lata) densiflora ; glnniis paulo 

 insequalibus dorsis scabris marginibus hyalinis, apicibus brevi-aristatis ; val- 

 vulis albo hyalinis gluma ^ brevioribus, inferiore longe aristata. 



Columbia plains, Oregon; Nuttall. 



Bristles of the lower valve 3 4 lines long and more than double the length 

 of those of the glumes ; awn of the lower glume a little larger than that of the 

 upper ; rays short, fasciculated, compound and many flowered ; glumes tinged 

 with purple. 



Vilfa agrostoidea, s. n. Culmo decnmbente (3 4 pedali) glabro 

 tereti ; foliis lineari-lanceolatis ; vaginis internodio parum brevioribus fauci- 

 bus dense pilosis ; panicula elongata 4 Spolicari basi nonnunquam in vagina 

 inclusa ; spiculis glabris parvis ovatis acutis ; glumis inasqualibus inferiore 

 superiore duplo breviore ; valvulis subsequalibus glabris acutis gluma longi- 

 oribus ; caryopsi rotunda ovata breviter apiculata glabra. 



Llano County, Texas. 



Panicles axillary ami terminal ; also often with their bases enclosed in the 

 sheaths, especially in a dry season, when at least one-half of the panicle is 

 thus encased ; rays opposite or alternate, scarcely more than an inch in length 

 and appressed ; flowers numerous and tinged with reddish-brown ; upper 

 glume nearly as long as the palea, which are shortly pointed ; throat of the 

 sheath densely bearded with long white hairs, which sometimes_extend about 

 an inch downward on the margins of the sheath. Radical leaves a foot or 

 more in length, and cauline leaves 2 6 inches long, and about 2 lines wide. 



Sporobolus (Vilfa) angustus, s. n. Radice fibrosa; culmo erecto 2 3 

 pedali, tereti simplice glabro ; vaginis striatulis glabris internodio duplice 

 brevioribus ; ligulis nullis ; foliis glabriusculis anguste linearibus apice 

 setaceis ; panicula elongata 5 8-policari anguste coarctata ; glumis insequali- 

 bus, inferiore ovata acuta vel obtusa valvula f breviore ; superiore acuta 

 inferiorem fere duplo excedente ; valvulis imequalibus niuticis membranaceis 

 acutis ; caryopsi ovoidea ellipsoidea obtuse caduca. 



Buchanan County. June. 



Glumes variable, the lower being not half the length of the upper and obtuse, 

 and again nearly equal to it in length and acute ; valves nearly equal or one 

 almost I longer than the other, nerveless, or the lower obscurely 1 3 nerved ; 



[Feb. 



