Briza.'] TRI ANURIA — DIGYNIA. 43 



ovato-lanceolate, rough at the back, nerved. Ext. valve of cor. ovato- 

 lanceolate, acute, white and diaphanous at tlie margin. 



14. P. nemordlis, L. {ivood 3Ieadoiv -grass); panicle slender 

 slightly leaning one way lax attenuate, spikelets ovato-lanceo- 

 late of about 3 rather distant slightly webbed florets, ligule 

 short truncate, culms subcompressed and sheaths glabrous, root 

 scarcely creeping. E. Bot. t. 1265. — (3. glauca ; smaller and 

 everywhere glaucous. Hook. Scot. i. p. 35 — P. glauca, E. Bot. 

 t. 1720 P. ccesia, E. Bot. t. 1719 P. glauca, /3. Wahl. 



Common in woods and thickets — /3. abundant on the Welsh and 

 Scotch Alps. Ft. June, July.lf.— 1— 3 feet high, slender and delicate 

 in all its parts. Leaves narrow, linear, acute. Panicle with the branches 

 almost erecto-patent. Spikelets scattered. Cal. valves unequal, ovato- 

 lanceolate, acute, rather obscurely ribbed, i^.i-^. valve of the cor. lanceo- 

 late, obscurely ribbed, pubescent on the keel and hairy at the base, very 

 slightly webbed. Inner valves, as I believe, in most, if not all of the 

 Genus, bifid at the point. — Sir J. E. Smith has, in E. Ft, united his 

 F. ccesia with P. glauca ; making it his var. /3. ; and now wlien 1 learn 

 from the same author that it is a plant gathered by Mr Turner and my- 

 self on Ben Lawers, I am more persuaded than ever that it is but an 

 alpine state of P. nemoralis. Mr Wilson thinks the same, and founds 

 his opinion on a most careful examination of specimens collected in 

 Wales and Scotland. 



35. Tkiodia. Br. Heath-grass. 



1. T. decwnbens, Beauv. (^decumbent Heath-grass); panicle of 

 few racemed spikelets, cal. as long as the florets, ligule a tuft 

 of hairs. — Poa decumbens, E. Bot. t. 131. — Festuca, L. 



Abundant in dry mountain-pastures, heaths and moors. Fl. July. 1/ . 

 — 1 foot long, procumbent ; flowering culms only erect. Leaves linear, 

 acuminate, hairy as well as the sheaths. Cal.-valves nearly equal, lanceo- 

 late, acute, nerved, with broad thin margins, scabrous on their keels. 

 Ext. valve of the cor. ovate, nerved or ribbed, having a small tuft of 

 hairs on each side at the base ; apex with three teeth. Int. valve obtuse, 

 entire at the point, ciliated at the angles of the fold. — In habit very dis- 

 tinct from Poa. 



36. Bkiza. hinn. Quaking-grass. 



1. B. media, L. {common Quaking-grass); spikelets broadly 

 ovateof about 7 florets, cal. shorter than the florets. E.Bot.t. 340. 



Meadows and pastures, frequent. Fl. June. %. — Whole plant very 

 elegant. Culms slender, 1 f. or more high. Leaves short, linear-acumi- 

 nate. Branches of the panicle thread-shaped, divaricating, purple. 

 Spikelets tremulous with the slightest breeze, very smooth, shining pur- 

 ple, more or less green, or greenish-white, at the edges. Ca/.-valves 

 very concave, subcompressed. Ext. valve of cor. much like the ccd., but 

 rather smaller ; int. one minute, resembling a fiat scale. 



2. B. minor, L. {small Quaking-grass); spikelets triangular 

 about 7-flowered, cal. longer than the florets. E. Bot.t. 1316. 



Fields in the extreme south of England, very rare. About Bath, in 

 Cornwall, Guernsey, and Jersey. Fl. July. Q . — Whole plant much 

 smaller than the last. Stipules elongated, acute. 



