132 74. Avena. 10. GRAMINEvE. Pl.end.ph 



7. Avena Alpina. Alpine oat. 



Spike upright; panicle nearly spikelike; leaves naked, 

 finely serrulate ; sheaths oblong, rough ; culm compressed. 



Avena planiculmis, Eng. Bot. 30, 2144. 

 Avena alpina, S7tiith T. L. S. 10, 335. 

 Trisetum alpinum, Roemer Syst. Veg. 663. 

 Gaudinia planiculmis, Pal, de Beauvois, 95. 



Mountain rocks ; perennial ; July. 



Root tufted; cidm 3 feet high; flowrets very large; o-acMs 

 haii'y at the top ; lomstce 3 to 5-flowered. 



XXXIV. 75.ARRHENATHERUM.Beauv. Dog-grass. 



Glumes membranous, 2-flowered; spathelles alternate, 

 shorter than the flowrets: lower flowret male; loiver 

 spathellule 2-lobed at the tip, lobes often torn-edged, ciliate; 

 awned on the back below the middle ; upper membranous, 

 hyaline, 2-cut, toothed; lodicule lanceolate, not notched, 

 smooth: upper flowret hermaphrodite; spalliellules 2-cut, 

 toothed ; lozver awned above the middle of tha back ; aiun 

 short or none; stigmata featherlike; cariopsis free, fur- 

 rowed. — Panicle branched, loose. 



1 . Arrhenatherum elatiiis. Tall dog-grass. 

 Panicle equally spread, rather csontracted, drooping; 



glumelles smooth ; hermaphrodite flowret nearly awnless ; 

 culm with smooth knots ; root knotty ; leaves smooth. 



Avena elatior, Lin. S. P. 117. 

 Avena elata, Salisb, Prod. 23. 

 Holcus avenaceus, fVigger Fl. Hokat, 72. 



Fields and pastures ; perennial ; June, July. 



Culm erect, 4 feet high ; leaves dark green, flat, recurved; 

 sheaths round ; ligula short; panicle oblong; peduncles 

 nearly verticillate ; spikelet large, whitish, or white and 

 purple. 



/3. muticum. Flowrets awnless. 



y. suhmuticum. Hermaphrodite flowret awnless. 



^, aristatum. Flowrets with long awns. 



2. Arrhenatherum hulbosum. Bulbose dog-grass. 

 Panicle equally spread, verticillate ; glumelles smooth ; 



hermaphrodite flowret nearly awnless ; knots of the culm 

 pubescent ; root bulb-bearing;. 



i 



