AEKHENATHERUM. 
hairs at their base, by which it may be distinguished from A . 
Sativa, the cultivated Oat. — [Sy. E. B. iii. distinguishes a. pilosissima 
(Gray); lower pales densely hairy becoming dark brown, p. A. intermedia 
(Lindg.); lower pales nearly glabrous becoming pale yellowish olive.] — Com- 
fields. A. VII. Wild Oat. E. S. I. 
t2. A. strigdsa (Schreb.) ; pan. secund, spikelets of about 2 
fl., fl. equalling the gl., lower pale ending in 2 long straight 
hristles.—E. B. 1266. P. 26.— Height 3 feet. Very like A. 
s'Tfii'a but readily distinguished by the bristles at the end of 
the fl.— Corn-fields. A. VII. E. S. 
** Upper gl.Z-veined. Spikelets erect. Root perennial. Lateral 
clusters of I. barren. L. with raised ribs. 
.3. A. jyj-aten'sis (L. em. Huds.) ; pan. erect with simple or 
.slightly divided branches, y?. erect 3—6 exceeding the glumes, 
/. rough. — E. B. 1204. P. .52. — Root fibrous. Height nearly 
2 feet. St. usually nearly round. L. usually short, narrow, 
acute. Pan. -branches usually simple with only one spikelet. — 
,i. longifolia (Parn.) ; 1. much longer. — 7. A. alpina (Sm.) ; st. 
often compressed and sheaths keeled, pan. -branches often with 
.several 5 — 6-fl. spikelets, upper pale less acute, 1. broader. I 
believe that none of these characters are permanent. E. B. 
•2141. P. 53. — A. planicuiinis of E. B. S. 2684 may belong to 
this species : it differs by its greatly compressed st., strongly 
keeled sheaths and more branched panicle. — In a and ^ the 
lowest fl. sometimes slightly falls short of the longer gl., in 7 
exceeds it. — Dry pastures and mountainous places. P. VI. 
E. S. 
4. A. 2)ubes'cens (Huds.) ; pan. erect nearly simple, fl. erect 2 
or 3 scarcely exceeding the glumes, lower I. and sheaths hairy. — 
JS. B. 1640. P. 53.— Creeping slightly. Height 1—2 feet. L. 
short, rounded behind the tip. — Chalky and limestone districts. 
P. VI. E. S. I. 
30. Arrhenath'eeum Beauv. Oat-grass. 
1. A. eldtius (M. & K.); 1. flat. — A. avenaceum (Beauv.). 
Holcus Sm., E. B. 813. P. 25.— Height 2—3 feet. Root 
fibrous. Knots of the st. glabrous, sometimes downy. Pan. 
long, ultimately close. Spikelets greenish. — /3. A. bidbosum 
(Presl) 3 base of the st. with swollen knobs, knots downy. 
P. 26.— Hedges and pastures. P. VI. E. S. I. 
