ARRHENATHERTTM. 495 



hairs at their base, by which it maybe distinguished from A t 

 sativa, the cultivated Oat. [Sy.E. B.iii. distinguishes a. pilosissima 

 (Graj r ) ; lower pales densely hairy becoming dark brown. J3. A. inter- 

 media (Lindg.) ; lower pales nearly glabrous becoming pale yellowish 

 olive.] Corn-fields. A. VII. Wild Oat. E. S. I. 



Very 



but readily distinguished by the bristles at the end of the fl. 

 Corn-fields. A. VII. E. S. 



** Upper gl. 3-veined. Spikelats erect.. Root perennial. Lateral 

 clusters of I. barren. L. tvith raised ribs. 



3. A.praten'sis (L.) ; pan. erect with simple or slightly divided 

 branches, fl. erect 3 6 exceeding the glumes, /. rough. E. B. 

 1204. P. 52. Koot fibrous. Height nearly 2 feet. St. usually 

 nearly round. L. usually short, narrow, acute. Pan.-branches 

 usually simple with only one spikelet. /3. longifolia (Parn.) ; 

 1. much longer. y. A. alpina (Sm.) 5 st. often compressed and 

 sheaths keeled, pan. -branches often with several 5 6-fl. spike- 

 lets, upper pale less acute, 1. broader. I believe that none of 

 these characters are permanent. E. E. 2141. P. 53. A. 

 planiculmis of E. B. 8. 2684 may belong to this species ; it 

 differs by its greatly compressed st., strongly keeled sheaths 

 and more branched panicle. In a and (3 the lowest fl. some- 

 times slightly falls short of the longer gl., in 7 exceeds it. 

 Dry pastures and mountainous places. P. VI. E. S. 



4. A. ptibes'cens (Huds.) ; pan. erect nearly simple, fl. erect 2 

 or 3 scarcely exceeding the glumes, lower /. and sheaths hairy. 

 E. B. 1640. P. 53. Creeping slightly. Height 12 feet. ^ L. 

 'short, rounded behind the tip. Chalky and limestone districts. 

 P. VI. E. S. I. 



30. ARRHENATH'EBTJM Pal. de Beauv. Oat-grass. 



1. A. avendceum (Beauv.) ; 1. flat. A. elatius (M. & K.) ed. 

 viii. Holcus Sm., E. B. 813. P. 25. Height 23 feet. Root 

 fibrous. Knots of the st. glabrous, sometimes downy. Pan. 

 long, ultimately close. Spikelets greenish. 8. A. bulbosum 

 (Presl); base of the st. with swollen knobs, knots downy. 

 P. 26. Hedges and pastures. P. VI. E. S. I. 



