S6 TRIANDRIA.— DIGYNIA. 



very slender; panic, with solitary branches; spik. 

 broad-cuneate ; anth. and stig. dark purple. 

 3, U. spicata: panicle spiked, straight ; leaves involute, 

 distichous, spreading ; spikelets 5 — 9-flowered ; 

 florets triandrous. 

 HAB. Salt-marshes, and on the sea-coast. Aug.— 

 Sept. If. Root long, creeping ; culm 12 — 18 in. 

 high ; spik. ovate, yellowish-green ; nect. obovate. 

 minute. 



70. BRIZA. Quaking-grass. 

 B. media : panicle erect ; spikelets at length cordate, 



about 7-flowered ; calyx smaller than the florets. 

 HAB. Meadows. May. If. Culm 1 Sin. high; stip. 



obtuse ; panic, capill. ; spik. tumid, purplish ; cor. 



nerveless. 



71. POA. Meadow-grass. 



1. P. annua: panicle subsecund, divaricate ; spikelets 



ovate-oblong, 5-flowered ; florets free ; culm ob- 

 lique, compressed ; root fibrous. 

 HAB. Fields, pastures, &c. April— Aug. 0. Ces- 

 pitose, 6 — 8 in. long ; panic, rather crowded, at 

 length spreading ; cur. pubescent, b-nerved. 



2. P. fasciculata : panicle expanding ; branches straight. 



fasciculate, crowded ; spikelets oblong, 3-flowered ; 

 florets free ; calyx minute, unequal ; culm oblique, 

 terete ; root fasciculate. 

 HAB. Salt-marshes. Aug. If. Culm 1— 2 ft. high, 

 firm; panic, at first oppressed; spik. subracemose ; 

 cor. smooth. 



.:. P. dentata : panicle loose, somewhat spreading : 

 branches capillary, virgate ; spikelets lanceolate, 5- 

 flowered ; calyx' free ; florets unequal ; inferior 

 glume obtuse, 3-nerved ; inferior valve of the co- 

 rolla 5-nervcd, 5-toothed at the apex when old. 

 HAB. Shady swamps. June— July. If. Root creep- 

 ing ; culm 3 ft. high; leav. and spik. pale green.; 

 pan. at first nodding. 



4. P. aquatica j&. americana : panicle erect, semi-verti- 

 cillate, diffuse ; branches flexuous, smooth ; spike- 

 lets linear, 6 — 8-flowered ; florets ovate, obtuse, 

 free ; leaves broad-linear, and as well as the sheaths, 

 smooth. 



