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NATURAL SCIENCES OF PHILADELPHIA. 89 



panicle 4 6 lines in width ; rays numerous and densely flowered ; leaves 

 4 8 inches long ; palea ^ longer than the seed. 



Vilfa rigid a, s. n. Culmo glabro rigido erecto 2 3-pedali tereti ; vaginis 

 glabris ; ligulis breviter ciliatis ; foliis glabris convolutis 6 8-policar. 1 

 lin. latis ; panicula patente terminate stricta ; radiis compositis solitariis 

 infimis basi nudis glabris ; spiculis acutis circum. 3 lin. Jongis ; glumis inse- 

 qualibus lanceolatis acutis inferiori superiore j breviori ; valvulis subcequali- 

 bus glabris acuminatis basi pilosis glumam superiorem aequantibus aut parum 

 excedentibus. 



Oregon ? In the herbarium of the Academy, without a label. 



Panicle 6 8 inches long and 2 inches broad in the widest part; lower 

 branches two inches long, with the lower half naked, and the upper with 

 short alternate branches, containing two or three florets each on short pedicels ; 

 upper branches with flowers from the base to the top. 



Vilfa (Sporobulus) alba, s. n. Culmo erecto glabro tereti simplici ; vaginis 

 glabris internodio longioribus aut parum brevioribus ; ligulis inembranaceis 

 apice laciniatis ; foliis planiusculis 4 8-policaribus glabris ; panicula coarctata 

 albescente 3 4-policari ; glumis insequalibus scabriusculis inferiore liueare 

 subacuta, superiore ovata acuta palea breviore ; valvulis insequalibus sub- 

 acutis muticis. 



Oregon. Spalding. 



Culm 1 2 feet high ; panicle contracted, densely flowered, 4 8 lines wide 

 and base scarcely exserted from the upper sheath ; lower glume about half as 

 wide as the upper, and nearly \ shorter; upper glume keeled, more or less 

 obscurely 3 nerved ; and little shorter than the lower valve, upper valve not 

 much longer than the lower, and both nerveless. 



Sporobulus (Vilfa) arenaceus, s. n. Radice fibrosa; culmo erecto vel 

 decumbente 6 10-policari ; foliis lineari-setaceis ; 1 3 policaribus ; vaginis 

 scabriusculis striatulis internodio longioribus vel brevioribus ; ligulis mem- 

 branaceis lacineatis 3 6 lin. Ion.; panicula patentissima ; radiis insequalibus 

 capillaribus paucifloris ; spiculis acutis ; glumis insequalibus uninerviis acutis 

 hyalinis valvula ^ brevioribus ; valvulis subrequalibus uninerviis vel carinatis : 

 acutis aut mucronatis caducis ; caryopsi ellipsoidea caduca. 



Hill sides, Western Texas. 



Radical leaves and abortive stems numerous ; panicle 3 4 inches long, and 

 its lower branches about 2 inches in length ; pedicles one flowered. 



Uralepis (Tricuspis) e 1 o n g a t a, s. n. Culmo erecto aut decumbente glabro 

 ad nodos piloso ; vaginis scabris internodium obtegentibus faucibus pilosis mar- 

 ginibus parce ciliatis ; foliis planis aut convolutis 8 12 policar. longis 1 2 

 lin. latis ; panicula elongata 7 9 policar. Ion. 2 3 lin. lata basi inclusa ; 

 rachi tereti scabra ; radiis solitariis erectis ; spiculis oblongis acutis 5 7-floris 

 breviter pedicellatis ; glumis ovatis subpequalibus acuminatis paniculis infimis 

 spiculam superantibus, superioribus spicula brevioribus ; valvulis ovatis 

 3-nerviis basi et margine infra dense ciliata, apice breviter 3-dentata, medio 

 dente breviter cuspidato ; valvula superiore apice bifida ovata ^ valvula 

 superiore breviori. 



Northern Texas. May. 



Internodes of the rachis 1 2 inches long, and the rays of about the same 

 length, with spikelets from base to top. Spikelets somewhat terete ; pedicels 

 1 3 lines long. Glumes on the lower part of the panicle as long or longer 

 than the spikelets, above they are shorter than the spikelets. 



Vilfa (Sporobulus) varians, s. n. Culmo erecto (1215 policari) ; va- 

 ginis internodium superantibus ; ligulis setiformibus ; foliis planiusculis mar- 

 gine scabriusculis convolutis ; panicula (5 6-policari) diffusa basi inclusa ; 



1862.] 



