IIOHDK.K. 647 



included in tlic upper slioatli, slij^litly compressed, light ;rreen, hoou 

 hnaking wlien mature, eiicli joint of the rachis 3 mm. iong, ahont 

 I null. wide. SpikeletH, inciudiiij,' awns, 4-5 cm. lon^r ; emj»ty 

 ;,duni('.s of llio middle one lanceolate, cjliiite on the margins; lloral 

 glume scabrous above, Hat on the back, l','-14 mm. long; palca but 

 little shorter. Stijies of lateral spikelets 1.5 mm. long; empty 

 glumes setaceous, 2-3 mm. long; lloral glumes and palea' like those 

 of the central floret. (Jrain flat, narrowly elliptical, 5.5 mm. long. 

 New Jersey (ballast-grounds), Sirilnivr for l'. S. Dept. Agrieul. 



lit. 



A native of Kurope, but now Avidely distributed in numy parts of 

 the world, rather sj)aringly introduced into North America. 



:. II. iiKXASTK iiox L. Sp. IM. H5(ir5;{). Six-Ko\vi:i) Haulky. 

 //. /irfenisfi/chi/on Heauv. Agrost. Ill (IS 12). 



An erect annual, (iO-SO cm. high. Spikes compressed, about 

 10 cm. long, not counting the erect awns, which are often 15 cm. 

 long; rachis stout, each joint 4 mm. long, not readily separating. 

 Spikelets all sessile and all fertile; emi)ty glumes slender, 

 bristles 1-3 cm. long; lloral glume jirominently nerved jibove, 10-12 

 mm. long, adhering to the grain. 



A well-knowji valuable plant, cultivated in a wider range of 

 clinuito than any other cereal. 



8. 11. KisTiciiON' L. S^). I'l. 85(17'5;{). T\vo-uo\vKit Uahlky. 

 ZeorrHon disticlnon lieauv. Agrost. 115 (1812). II. inil/crhe Ar- 

 duini. K. & S. Syst. 2:;();} (1817). This differs from the above 

 chiefly as follows: lateral spikelets stipitatc;, neutral; floral glume 

 of lateral spikelets obtuse, acute, or short awned. 



Often cultivated. 



144. (275). Elymus L. Sp. PI. S3 (175:5). Cnlhnp.sis .luub. & 

 Spach, Illustr. 4 : ;3(), /. ;521 (1850). Lri/»ii>s llochst. Flora 31 : 118 

 (1848) in foot-note. Or/Iiusfarhi/s Elirli. I'.eitr. 4 : 140 (1789). Po- 

 ?//rt><///cri.c Xees, Ann. Nat. Hist. (I) 1 : 284 (1838). Silanidn Ifalin. 

 Journ. Phys. 80 : 103 (1810). Sifospdo!^ Adans. Fam. 2 : 3G (1763). 



Spikelets 2-0-flowered, 2-0 together, sessile at the nodes of the 

 more or less excavated rachis of the simple spike, raehilhi articulate 

 below the ilorets, flowers perfect or the upper imperfect or reduced 



