418 MONOCOTYLEDONOUS PLANTS. 



late, in pairs ; rachis hairy; abortive floret neuter ; valves awned. 4. 



purpurasccns Miihl. 



HAB. Rocky woods. N. Y. to Car. Aug. If. Culm 3 feet 

 high, with lateral scattered branches, purplish. Spikes slender, 

 flexuous. Beard Grass. 



2. A. virginicus Linn. : culm compressed ; superior leaves and 

 sheaths smooth ; spikes short, 23 from each sheath, partly conceal- 

 ed at the base ; rachis subtercte ; abortive flower a mere pedicel with- 

 out valves ; perfect flower monandrous. A. dissitiflorum Mick. 



HAB. Swamps. Penn. to Vir. Sept. If. Culm 3 feet high, 

 somewhat cespitose. Spikes partly concealed in a sheath. 



3. A. macrourus Mich : spikes fasciculate, in dense, lateral, and ter- 

 minal fastigiate panicles ; flowers monandrous ; awn straight ; 'abor- 

 tive floret without valves. 



HAB. -Swamps. N. J. to Car. Sept., Oct. U.Culm 3 feet 

 high, much branched towards the top. Spikes in large clustered 

 panicles, partly concealed. 



4. A.furcatus MuJU. : spikes digitate, generally in fours ; abortive 

 flowers staminiferous, awnless, resembling the perfect one, the awn of 

 which is subcontorted. 



HAB. Rocky banks of streams. N. Y. to Car. Aug., Sept. 

 2J.. Culm 23 feet high. Spikes terminal, 34, 3 inches 

 long. . 



5. A. nutans Linn. : panicle oblong, branched, nodding ; spikelets 

 by pairs; glume hairy, refuscent; awn contorted. A* avenaceum Mich. 



HAJS. Sandy fields. N. S. to Car. Sept., Oct. y. r///,/ 

 36 feet high, simple. Panicle at first erect, at length nodding. 



54. GYMNOPOGON. P. de Beauv. 



Glume 2-valved, carinate, nearly equal, longer than the 

 floret. Paleee nearly equal ; the lower one with a straight 

 bristle a little below the tip. Rudiment aristiform. Spike 

 panicled. Triajidria. Digynia. 



G. racemosum P. de B. : culm ascending ; leaves distichous, cordate- 

 lanceolate, nerved, short ; flowers appressed. Andropogon ambiguwn 

 Mich. Muhl. AnUwpogon lepturoides Natt. 



HAB. Sandy fields. N. J. to Geor. Aug. U.Culm 2 feet 

 high, assurgent. Panicle large, pyramidal, somewhat verticillate. 



Div. VIII. ORYZE^E. Inflorescence panicled. Spikelets so- 

 litary, \-flowered. Lower palea cartilaginous, compressed, 

 keeled. Stamens often more than 3. 



55. LEERSIA. Linn. 

 Spikelets 1-flowered. Glume none, Palea 2, beardless, 



