TRIAND. DIGYN. 43 



10. Br. sterUls (barren Brome-grass), panicle drooping slightly 

 branched, spikelets linear-lanceolate, florets remote, subcylin- 

 drical scabrous shorter than the straight awn, leaves pubescent. 

 Lightf. p. 104. E. B. t. 1030. 



HAB. Waste ground, hedges and fields, common. Fl. June, July. O . 

 Two feet high. Remarkable for its long, narrow, much awned, and 

 drooping spikelets. 



11. Br. diandrus (upright annual Brome- grass), panicle erect 

 slightly branched, spikelets linear-lanceolate, florets remote 

 subcylindrical subscabrous about as long as the straight awn, 

 stamens 2 (sometimes 3, Schrad.), leaves subglabrous. E. B. 

 t. 100ft. 



HAB. About Edinb., bat not common, Mr. Arnott. Fl. June, July. . 

 One foot high. Allied to B. sterilis ; but panicle smaller, erect or erecto- 

 patent, often purplish. 



26. AVENA. 



1. A. fatua (wild Oa/), panicle erect, spikelets drooping of 

 about 3 flowers, florets smaller than the cal. hairy below, root 

 fibrous (annual). Lightf. p. 105. E. B. t. 2221. 



HAB. Corn-fields, Sibbald. Fl. July, Aug. O . 



Two to three feet high. Leaves linear-lanceolate. Cal. valves large, 

 membranous, ovato-lanceolate, keeled, acuminate, ribbed. Cor.ext. 

 valve with long fulvous hairs, bifid at the point. Awn long, twist- 

 ed. An excellent hygrometer. 



2. A. pulescens (downy Oat-grass), panicle erect nearly simple, 

 spikelets of about 3 flowers which are longer than the cal. 

 their pedicels villous, leaves plane downy, edges smooth. Lightf. 

 p. 105. E. B. t. 1640. 



HAB. Dry mountain pastures, Lightf. Pastures about Glasg., but 

 rare ; banks of the Cart opposite the Mill, Hopk. Arthur's seat, 

 Salisbury Craigs and shores of the Firth, Mr. Arnott. Fl. June, 

 July. If. . 



Spikelets half the size of the former, nearly erect. Upper part of the 

 glumes very white, silvery. Cal. valves lanceolate, acute. Ext. valve 

 of the cor. oblong, jagged at the extremity j int. very membranous, 

 point bifid. Pedicel or receptacle of the floret with a tuft of long 

 white hairs. 



3. A. planicnlmis (ftat-strawed Oat- grass], panicle erect 

 slightly branched (subspicate), spikelets of about 5 flowers 

 which are much longer than the cal., margins of the leaves 

 and sheaths scabrous, culms and sheaths compressed. E. B. 

 /.2141. 



HAB. Rocks on the summits of the highest mountains in Clova, An- 

 gus-shire, G. Don. Fl. July. I/. . 



Two feet high. Leaves all very broad without pubescence. Receptacle 

 of the florets less hairy than in A.pubescens, with which the general 

 appearance of the plant agrees. 



'1. A. pratensis (narroiu- leaved Oat-grass), raceme erect simple^ 



