TRIANDRIA.— DIGYNIA. 55 



HAB. Meadows, dry woods, &c. May — Aug. ty . 

 Afoot high; leav. pubesc. ; pan. spiked ; seed black. 



66. BRACHYELYTRUM. 



B. aristatum. 



HAB. Rocky hills. June — July, 1/. Root creeping , 



culm erect> simp., 2 — 3 ft. high ; pan. racemose ; awn> 



twice as long as the fl. 



61. PHRAGMITES. Reed-grass. 



P. communis: calyx about 5-flowered ; florets longer 



than the calyx. 

 HAB. Borders of ponds, and swamps. Aug. If.. Culm 



6 — 12 ft. high, thick; leav. 1 — 2 in. broad; pan. 



large nodding ; fl. silky. 



68. 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. 2£. Root creeping, 



cidm 3 — 5 ft. high, compress., assurg. ; pan. 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 — 4 ft. high, 



subcompress. ; stip. elongat. ; pan. long, concealed at 



the base. 



69. UNIOLA. Spike-grass. 



U. latifolia: leaves broad and flat; panicle loose, 

 nodding ; spikelets all on long peduncles ; florets 

 somewhat ialcate, monandrous ; the lowest one 

 abortive. 



HAB. Mountains and rocky woods. Au<r. 1/. Culm 

 Aft. high ; pan. very large ; spik. an inch long, flat, 

 ovate. 



I . gracilis : panicle elongated, racemose, appressed 

 spikelets 3-flowered ; florets spreading, straight, 

 monandrous; the lowest one abortive. 



1 1 A 13 . Sandy swamps. Aug. 1^. Culm 3 — 1 ft. high, 



