96 



PROCEEDINGS OF THE ACADEMY OF 



3 branches is about 1J inch in length ; the remainder, the one is sessile and 

 one-spiked, the other nearly | an inch long and two-spiked ; the upper 

 branches are about i an inch long and 1 3-flowered ; some of the palea are 

 smooth and nerveless, and others distinctly nerved ; florets 3 4 lines long, 

 the two upper somewhat divided from the lower, being distant from each 

 other on the rachis 1 2 lines. 



Glyceria micro thee a, s. n. Caule erecto geniculato simplici glabro 

 tereti ; vaginis glabris internodio brevioribus ; ligulaconspicua apice fissa basi 

 decurrente ; foliis planis 3 4-policaribus et 3 4 lin. latis glabris ; panicula 

 patente 3 4-policari 3 4 lin. lata; radiis geminis compositis basi nudis 

 parum scabris ; spicuHs ovatis sub 5-floris ; glumis inrequalibus scariosis ob- 

 tusis ; valvulis apice scariosis obtusis, inferiore distincte 5-nerviarare 7-nervia, 

 interiore apice bifida. 



Oregon, Columbia River. Nuttall. 



Panicle terminal, with few pairs of branches at intervals of h 1 inch apart, 

 lower branches about 2 inches long ; spikes about 4 lines long and 1 2 broad 

 on filiform pedicels ; valves caducous, glumes persistent. 



Glyceria m o n t a n a, s. n. Radice fibrosa ; culmo erecto tereti simplici 

 glabro 10 15-policari ; vaginis glabris internodio longioribus superiore mar- 

 ginibus albo-hyalinis ; ligula ovata integra 1 2 lin. longa ; foliis planis vel 

 convolutis 4 5 pol. longis et 1 2 lin. latis ; panicula elongata interrupta basi 

 inclusa 3 5-policari 6 8 lin. lata ; radiis 2 4-nis erectis compositis sca- 

 bris lh 2-policarihus ; spiculis 3 4-floris ovatis acutis ; glumis ovatis ; valvu- 

 lis ovatis acutis, inferiore obscure 7 nervia. 



Rocky Mountains. Nuttall. 



Intervals on the rachis between the branches of the panicle J 1 inch long ; 

 lower branches naked near the bases and 4 5 spikes at and near their ex- 

 tremities ; spikes small, pale green ; a semi-transparent membrane from the 

 ligula extends down along the margins of the sheath 1 2 inches. 



Poa laxi flora, s. n. Culmo erecto 2 3-pedali simplici geniculato 

 scabro ; vaginis internodio multo brevioribus scabris ; ligula conspicua sub- 

 obtusa 23 lin. longa; foliis planis scabris 4 5-policaribus 2 3 lin. latis ; 

 panicula patente circum 6 policari ; radiis 2 4-nis compositis filiformibus 

 1 2-policaribus ; 3 4-stachyis ; spiculis pedicellatis 3 4-floris laxis ; glumis 

 insequalibus acutis dorso scabris; valvula inferiore oblongo-ovata acuta 

 obscure 5 -nervia glabra basi parum villosa ; interiore basi et dorso parce 

 ciliata. 



Oregon, Columbia Woods. Nuttall. 



Culm 6 8 inches below the panicle, naked ; leaves few. 



Poa t en ui folia, s. n. Radice fibrosa ; culmo geniculato glabro rigido 

 tereti (1 IV pedali), vaginis internodio brevioribus glabris ; ligulis 3 4 lin. 

 longis ovatis fissis ; foliis planis vel convolutis basi plurimis (3 4-policaribus), 

 parum scabris aut glabris 1 2 lin. latis ; panicula coarctata 3 4-policari 

 8 12 lin. lata; radiis 2 3 nis ad pressis scabris compositis apice multista- 

 chyis ; spiculis 2 3-floris oblongo ovatis acutis ; glumis subaequalibus ovatis 

 acutis scabris ; valvula inferiore margine et dorso scabra obscure 5-nervia 

 basi nuda ; interiore margine ciliata. 



Columbia River. Nuttall. 



Poa d ens i flora, s. n. Culmo erecto (l.> 2 pedali) glabro; vaginis 

 internodium obtegentibus glabris ; ligula membranacea brevissima truncata ; 

 foliis planis (4 9-policaribus) marginibus scabris 2 3 lin. latis ; panicula 

 conferta parum interrupta 2 8-policari 10 12 lin. lata ; radiis 5 7-nis 

 dense spicatis scabris; spiculis 5 9-floris distichis lato-ovatis sublaxis ; 

 ^lumis parum insequalibus carinatis dorso scabris acutis ; valvula inferiore 



[Feb. 



