164 TRIANDRIA— DIGYNIA. Avena. 



the much longer dorsal spiral one, proper to the genus. The 

 same valve is moreover sometimes hairy. The^oreis, naturally 

 2, are sometimes .3 or 4. The partial stalk, elevating the se- 

 condjloret, has a lateral tuft of hairs near the top. 



3. A. jmbescens. Downy Oat-grass. 



Panicle erect, nearly simple. Florets about three, longer 

 than the calyx. Partial stalk bearded. Leaves flat, 

 dovi^ny. Root somewhat creeping. 



A. pubescens. Unn. Sp. PL 1665. Willd. v. 1 . 448. H. Br. 140. 



Engl. Bot.v. 23. t. 1640. Knappt. 90. Hook. Scot. 43. Sincl.\67. 



Schrad. Germ. v. 1 . 382. Leers 43. t. 9./. 2. Host Gram. v. 2. 



37. t. 50. Fl. Dan. t. 1203. Ehrh. Calam. 7. 

 A. sesquitertia. Linn. Mant. 1 . 34 ; excl. the reference to Scheuchzer. 



Willd. Sp. Pl.v. 1.448. 

 A. n. 1498. Hall. Hist. V. 2. 234. 

 Gramen avenaceum 7, seu glabrum (potiiis hirsutum) panicula 



purpuro-argentea splendente. Raii Syn. 406. ^. 2 1./. 2. ed. 2. 



262. n. 10 5 see also p. 252 S^ 345. 

 G. avenaceum, panicula purpuro-argentea splendente. Schtuchz. 



Agr. 226. t.4.f.20. 



In pastures on a chalky, or limestone soil. 



Frequent in the open chalky parts of Norfolk, Cambridgeshire, and 

 Oxfordshire, as well as in other counties where the soil is similar. 



Perennial. June. 



Root strong, in some degree creeping, with slightly downy fibres. 

 Stems li or 2 feet high, simple, straight, except at the lowest 

 joint, smooth, leafy. Leaves flat, obtuse, sjjreading, clothed all 

 over, as are also tlie sheaths of the lower ones, with soft spread- 

 ing hairs. S^ipwZas acute, triangular ; the upper one elongated. 

 Panicle upright ; all its branches in general simple, 3 or 4 to- 

 gether, rough, erect, as well as the spikelets. Florets mostly 2, 

 with an imperfect one, all on a long, bent, bearded partial stalk. 

 Corolla with a purple stain. Glumes all shining and pellucid at 

 the summit. .Jwn brown, rough, from the middle of the valve, 

 twice as long as the calyx. Styles very short. 



4. A. pratensis. Narrow-leaved Oat-grass. 



Panicle erect, with very short simple branches. Florets 

 about five, longer than the calyx. Partial stalk all over 

 hairy. Leaves involute, finely serrated, naked ; sheaths 

 smooth. 



A. pratensis. Linn.Sp.Pl.\\9. IVilld. v. \.45\. Fl.Br.WQ. Engl. 

 Bot. V. 17. t. 1204. Knapp t. 91. Hook. Scot. 43. Sincl. 201. 

 Schrad. Germ. v. 1. 385. Host Gram. v. 2.38. t. 51. Leers 43. 



t.g.f.i. 



