568 



I'OACEiE. 



mm. long; floral glume broiully oval when spread, 2-2.3 mm. long, 

 7.nervea; pulea nearly as long as its glume, incurved. SpikeleU 

 smaller, less turgid and greener than those of P. Cnuutensis. 

 Maine (Mt. Desert, Seal Harbor), ./. H. IMjiM in 1894. 

 7. P. Americana (Torr.) Mai^Millan, Metasp. Minn. 1:81 

 (1802) Fod (tqunliM var. Amerirom Torr. Fl. V. S. 1:108 

 (1824). G. aqnadra J. E. Snuth, Kngl. Fl. 110 (1824). not 

 AVahl. G.grandi^ S. Wats. A. Cray, Man. Ed. G, COT (1890). 

 Panmaaria aqiiatua {li.)K\n\^y.Q^ Kev. (leu. PI. 782 (1891). 



A robust pereuuial, with ereci.ing rootst.»eks; eulnis 90-1 '.() cm. 



high. Sheaths m<»stly shorter than 

 the internodes ; li.uide 2-;3 mm. long; 

 blades 4-5 in number, flat, smooth 

 or seabrid, SO-00 cm. long, 8-15 

 mm. wide. Panicle oblong or oval, 

 20-40 cm. long, rays numerous, 

 ascending, nodding, bearing many , 

 spikelets. Spikelets oblong or 

 linear-oblong, nsiially jiurplish, 5- 

 9-flowered, 4-0 mm. long, joint of 

 rachilla 0.7 mm. long: empty 

 glumes oblong or oval, acute or ob- 

 tuse, 1-nerved, first 1.5-2 mm. 

 h)ng, second 2. 5-;5niiM. long; floral 

 glume oval, 2.5 nun. long, 7-nerved, apex truncate, obtuse, often 

 denticulate under a lens; palea elliptical, 2-toothed, nearly 2.5 mm. 



long. 



Massachusetts, Beal 115; Michigan, Cuolv,,, Clark 2055: Mm- 

 nesohi, Arthur B 97, 1^203; Monhuv.i, Ant/ersan 70; Colorado, 

 Cassidy; Dakota, Duffei/j AVyoming, /luffian C 52. 



Wet grounds, Canada to :Montana, New Mexico, Northern States 



to Tennessee. /-.unn 



8. P. pauciflora (Presl) Kuntzc, l{ev. Cien. PI. 783 (18J1). 



Glyceria paucifiora Presl, llcl. llaMik. 1 : 257 (1830). 



A robust perennial, 30-120 cm. high, from creeping rootstocks. 



Sheaths shorter than the internodes, or longer, in small plants; lig- 



FiG. W^.—Panicularia Americana. 

 Spikelet. (Uic'.-.ardson). 



