GRAMINE^E. 417 



2. L. temulentum Linn. : florets shorter than the glumes, as long as 

 the bristle at their extremity ; root annual ; culm scabrous above. 



HAB. N. Eng. and Penn. Muhl. July. ^.Culm 2 feet high. 

 Spikelets much compressed. 



52. SPARTINA. Schreb. 



Flowers in unilateral spikes, imbricated in 2 rows. Glume 

 2-valyed, compressed, unequal. Palea 2, awnless, unequal. 

 Scales collateral. Triandria. Monogynia. 



1. $. cynosuroides Willd. : spikes numerous (10 40,) pedunculate, 

 panicled, spreading ; leaves broad, flat, at length convolute ; one glume 

 with a short awn ; style 2- cleft at the summit. S. polystachya Muhl. 

 Lymnetis cynosuroides and polystachya Pursh. 



HAB. Meadows. Can. to Car. Aug. 2f. Culm 410 feet 

 high. Leaves 1 3 feet long. Spikes linear, scattered. 



Marsh Grass. 



2. & juncea Willd. : leaves distichous, convolute, spreading ; spikes 

 few, (1 3,) pedunculate; peduncles smooth; paleas rather obtuse; 

 styles 2. Limnetis juncea Pursh. 



HAB. River banks and marshes. Can. to- Car. July, Aug. Z. 

 Root creeping, forming thick tufts. Culm 18 inches long, 

 smooth. Spikes 3 5 ; lower one peduncled, 



3. &. glabra Muhl. : leaves concave, erect ; spikes alternate, sessile, 

 erect, appressed ; palese nearly smooth on the keel ; style cleft about 

 halfway down. 



HAB. Marshes. N. Y. to Car. W. to Miss. Aug., Sept. 1C. 

 Culm 3 5 feet high, smooth and somewhat succulent. Spikes 

 814, closely appressed to the rachis. 



Div VII. SACCHARINEJE. Inflorescence spiked or panicled, 

 jointed. Spikelets generally in pairs, 1 or 2-jtowered, the 

 one sessile, the other peduncled and usually monoclinous. 

 Glumes of a stouter texture than the palece, neither keeled 

 nor opposite. Palece very delicate and membranous, not 

 with a keel, the lower commonly bearded. 



53.' ANDROPOGON. linn. 



Flowers spiked. Spikelets in pairs, polygamous ; the lower 

 one abortive, on a bearded pedicel. Glumes and palea often 

 very minute or wanting, Upper spikelet sessile, 1-flowered, 

 perfect. Glume subcoriaceous. Palea 2, shorter than the 

 glume, membranous"; lower one generally awned. 



Triandria. Digynia. 



1. A. scoparius Mich. : spike simple, lateral and terminal, peduncu- 



