308 TRIANDRIA DIGYNIA. 



HAB. Meadows, dry woods, &c. May Aug. 1\.; afoot high, 

 leaves pubescent ; pan. spiked ; seed black. 



46. BRACHYELYTRUM. 



B. aristatum. 



HAB. Rocky hills. June July, 7J.; root creeping ; culm erect, sim- 

 ple, 2 3 feet high ; panicle racemose ; awns twice as long as the Jl. 



47. PHRAGMITES. Reed-grass. 



P. commnnis : calyx about 5-flowered ; florets longer than the calyx. 

 HAB. Borders of ponds and swamps. Aug. 7|_; culm 6 12 feet 

 high, thick leaves 1 2 inches broad; panicle large, nodding ; flower 

 silky. 



48. GLYCERIA. 



G. Jluitans : panicles secund, slightly branched ; spikelets linear, terete, 



appressed, 8 12-flowered ; florets very obtuse, 7-nerved ; leaves 



long, flat. 

 HAB. In water. June July, QJ.; root creeping; culm 3 5 feet 



high, compress., assurg. ; panicle long, racemose. 

 G. acutiflora : panicle simple, elongated, appressed ; spikelets linear, 



terete, 4 12-flowered ; florets attenuate, acute, indistinctly nerved ; 



leaves short, erect. 

 HAB. Wet meadows. June ; culm 2 \fect high, subcompres. ; stip. 



elongate ; panicle long, concealed at the base. 



49. UNIOLA.' Spike-grass. 



U. spicata: panicle spiked, straight; leaves involute, distichous, spread- 

 ing ; spikelets 5 9-flowered ; florets triandrous. 



HAB. Salt-marshes, and on the sea-coast. Aug. Sept. 7j_; root 

 long, creeping; culm 12 18 inches high; spik. ovate, yellowish 

 green ; nectary obovate, minute. 



50. BRIZA. Quaking-grass. 



B. media : panicle erect ; spikelets at length cordate, about 7-flowered ; 



calyx smaller than the florets. 



HAB. Meadows. May, Tj.; culm 18 inches high; stip. obtuse ; pan- 

 icle capillary ; spik. tumid, purplish ; cor. nerveless. 



51. PGA. Meadow-grass. 



P. annua : panicle subsecund, divaricate ; spikelets ovate-oblong, 5- 



flowered ; florets free ; culm oblique, compressed ; root fibrous. 

 HAB. Fields, pastures, &c. April Aug. <2> ; cespitose ; 6 8 inches 



long ; panicle rather crowded, at length spreading ; corolla pub&3- 



cent, 5-nerved. 

 P. aquatica b. americana: panicle erect, semi-verticillate, diffuse; 



branches flexuous, smooth; spikelets linear, 6 8-flowered; florets 



ovate, obtuse, free ; leaves broad linear, and as well as the sheaths, 



smooth. 

 HAB. Wet meadows. Aug. 1\. ; culm 4 5, thick, leafy ; panicle 



very large, at first nodding ; spik. purp. 



