GRAMINE.E. 409 



woolly at the base, the upper bifid-toothed. Scales smooth. 

 Panicle more or less branching or scattered. 



Triandria. Digynia. 



1. P. annua Linn. : panicle subsecund, divaricate ; spikelets ovate- 

 oblong, 5-flowered ; florets free j culm oblique, compressed ; root fi- 

 brous. 



HAS. Fields, &c. Can. to Car. April Aug. (gfc. Culms ces- 

 pitose, 6 8 inches long, very smooth. Panicle crowded, at 

 length spreading. Meadow Grass. 



2. P.fasdculata Torr. : panicle expanding; branches straight, fas- 

 ciculate, crowded ; spikelets oblong, 3-flowered ; florets frees ; glumes 

 minute, unequal ; culm oblique, terete ; root fasciculate. 



HAS. Salt marshes. N. Y. Aug. H.Culm 12 feet high. 

 Panicle appressed. 



3. P. dentata Torr. : panicle loose, somewhat spreading ; branches 

 capillary, virgate ; spikelets lanceolate, 5-flowered ; glumes free ; 

 florets unequal ; inferior glume obtuse, 3-nerved ; lower palea 5-nerv- 

 ed, 5-toothed at the apex when old. 



HAB. Swamps. N. S. June, July. Z. Root creeping. Culm 

 3 feet high. Panicle large, nodding when young. 



4. P. aquatica var. americana Torr. : panicle ereat, 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. P. aquatica Pursh. 



HAB. Wet meadows. Can. and N. S. Aug. 2. Culm 4 5 

 feet high, thick and leafy. Panicle very large, purple. 



5. P. maritima Huds. : panicle branched, somewhat crowded ; spike- 

 lets about 5-flowered, terete; florets rather obtuse, indistinctly 5- 

 nerved ; root creeping. 



HAB. Salt marshes near Boston, Mass. Big. June. 2J.. Culm 

 a foot high. Panicle erect, with the branches in pairs and flex- 

 uous. 







6. P. brevifolia Muhl. : panicle loose ; branches in pairs, horizontal j 

 glumes 3 4-flowered ; paleae pubescent ; leaves very short ; stipules, 

 acuminate. 



HAB. Woods. Penn. Muhl. April. 2{.Culm 2 feet high, 

 oblique and somewhat angular. Panicle loose, flexuous. 



7. P. pungens Torr. : culm compressed ; leaves very short, cuspi- 

 date ; panicle somewhat simple, spreading ; spikelets ovate, 3 4- 

 flowered ; florets webbed, rather obtuse, obscurely 5-nerved. P. fax- 

 uosa Muhl. 



HAB. Rocky woods. Penn. April. ! Culm 18 inches high, 

 subancipitous. Panicle small, semiverticillate. 



8. P. pratensis Linn. : panicle diffuse ; upper leaves much shorter 



35 



