TRIANDRIA.— DIGYNIA. 73 



pubescent ; spikes numerous, setaceous ; spikelels 



all pedicellate ; inferior glume very minute. 

 HAB. Fields. U« ft° ut creeping; culm 12 — 18 in. 



long. 

 D. filiformis : culm erect, filiform ; leaves somewhat 



glabrous ; spikes 2 — 4, filiform, erect ; spikelets in 



threes, all pedicellate ; calyx 1-valved, as long as 



the abortive floret, pubescent. 

 HAB. Gravelly soils and sandy woods. Aug. 0. Culm 



simp., 12 — 18 in. high; leav. short ; spik. mostly 2. 



98. ANDROPOGON. Beard-grass. 



A. scoparium : spikes simple, lateral and terminal, 

 pedunculate, in pairs ; rachis hairy ; abortive floret 

 neuter ; valves awned. 



HAB. Barren soils. Aug. U . Culm 3 ft. high; lower 

 sheaths hairy ; spik. slend.,flexuous. 



A. virginicwn • culm compressed ; superior leaves 

 and sheaths smooth ; spikes short, 2 — 3 from each 

 sheath, partly concealed at the base ; rachis sub- 

 terete ; abortive flower a mere pedicel without 

 valves ; perfect flower monandrous. 



HAB. Dry swamps. Sept. y.. Culm 3 ft. high ; inf. 

 leav. hairy ; rachis pilose. 



A. macrourum : spikes fasciculate, in dense, lateral. 

 and terminal fastigiate panicles ; flowers monan- 

 drous; awn straight; abortive floret without valves. 



HAB. Swamps. Sept. — Oct. If.. Culm much branched 

 above ; spikes vaginate, partly concealed. 



A. furcatum : spikes digitate, generally by fours; 

 abortive flowers etaminiferous, awnless, resembling 

 the perfect one, the awn of which is subcontorted 



HAB. Rocky banks. Aug. — Sept. 1*. . Culm 4 ft. 

 high ; rati. !<dv. very long; cul. brownish. 



,\. nutans : panicle oblong, branched, nodding; spike- 

 Lets by pairs; calyx hairy, rufescent; awn con- 

 torted. 



HAB. Fields and hills. Sept.— Oct. 11. CWro3— G 

 ft. high; pan. large; abort, ft. a rudiment without 

 vahes. 



HORDE! M. Bailey. 



M. y "latum: lateral flowers abortive, n eute J I 



(J 



