GRAMINEiE. 451 ANDROPOGOK. 



1. E. Virgi'nicus. Lime Grass. 



Stem erect, smooth, 3 — 4 feet high ; leaves lance-linear, flat, scabrous, deep 

 green, ^ inch broad ; sheaths nerved ; stipule very short; spike erect, thick, 

 3 — 5 inches long; spikelets in pairs, about 3-flowered ; ghimes both in front, 

 lance-linear, slightly connate at base, produced into a scabrous awn ; flowers 

 smooth; lower pulea awned. Banks of streams. July. Aug. 



2. E. Canade'nsis. E. glaucifoHus. P. 

 Slen erect, smooth, stout, 3 — 5 feet high ; leaves lance-linear, flat, smooth, 



dark green or often glaucous ; spike rather spreading, 4 — 8 inches long, gen- 

 erally nodding at the summit; rachis hairy ; spikelets 2 — 5-flo\vered ; gluvies 

 5 — 7-nerved, shoit-awned, hairy ; lo7vcr palca iiairy, awned. A tall, beautiful 

 grass, with long, recurved, waving spikes. River banks, «tc. Aug. 



3. E. viLLo'sus. Rye Grass. 



Stem slender, striate, sipooth, 2 — 3 feet high ; leaves rough-edged, pubescent 

 above, i inch broad ; sheaths hairy, especially the lower ones; spike 2i — 3^ 

 inches long, a little nodding and spreading ; rachis and flowers hispid, pilose ; 

 spikelets 1 — 3-flowered; ^Zunics linear; lower palea with a long, straight 

 awn. Dry grounds. July. 



4. E. Hystrix. Hedgehog Grass- 

 Stem round, smooth, 2 — 4 feet high ; le'ives lance-linear, carinate, scabrous, 



generally glaucous and with the sheaths striate ; spike 4 — 6 inches long, erect ; 

 rflcAi's nearly smooth, flexu^ous ; spikelets remote, diverging, almost horizon- 

 tal, 2 — 3-flowered; glumes 0, rarely 1 or 2 ; flowers smoothish ; loirer palea 

 terminating in a very long awn. An odd looking grass, common in moist 

 woods. July. 



Tribe 10. SACCHARINEiE. 



Inflorescence pnnirlfd or apik'cl. Spikelets generaUy in pairs, one sessile and perfect, the other 



mostly pedicellate and imperfect. Ciliimcs of stouter texture tliun the paUa:. Valta. delicate and 



membranaceous, the loiver commonly awned. 



46. ANDROPO'GON. 



Spikelets in pairs, polygamous, the lower one incomplete, 

 on a plumosely 'bearded pedicel, upper one l-flowered, per- 

 fect; glumes subcoriaceous, awnless ; paleae shorter than the 

 gkimcs, one generally awned. 



1. A. furca'tus. Mvh. Forked Spike. 



Stem semiterete above, 3 — .'i feet high ; haves lance-linear, rongh-edged, 

 radical ones very long; sjiikes digitate or fasciculate, in 2s — 5s, 3 — 5 inches 

 long, purple ; spikelets appressed, abortive one on a plumose pedicel, stami- 

 nate, with 2 palese, awnless, perfect one with 2 unequal glumes ; lower palea 

 bifid, awned between the divisions. Meadows and low grounds. Aug. 



2. A. scopa'rius. Mx. Purple Brown Grass. 



Stem slender, paniculate, 3 feet high, branched, one side furrowed, branches 

 fascicui;ite, erect; Icares lance-linear, somewhat hairy and glaucous ; spikes 

 simple, lateral ann terminal, on long peduncles, 2 — 3 from each sheath, purple; 

 spikelets remote, abortive one neuter, mostly with 2 palejE, awned. Woods. 

 Aug. 



3. A. Virgi'nicus. 



CiEspitose ; s'fl?7i subcompressed, 3 feet high, branches few and short, half 

 concealed ; leaves linear, lower ones a foot or more long, rough-edged and 

 hairy ; slienths smooth ; spikes short, in slender, half concealed fascicles of 2 

 or 3, lateral and terminal ; abortive spikclet a mere pedicel, without paleffi, pcr- 

 fect monandrous, with a straight awn. Swamps. Sept. 



