164 TRIANDRIA— DIGYNIA. Avena. 



A. strrgosa. Schreb. Lips. 52. Willd. Sp. Pl.v.l. 446. Fl.Br.\390. 

 Engl. Bot. v. 18. t. 12(56. Comp. 19. Knapp t. 92. Don H. 

 Br.S\. Schracl. Germ. v. 1. 368. Host Gram. v. 2. 41. t. 56. 

 Ehrh. Calam. 38. 



In cornfields. 



Common in Scotland, Wales, Yorkshire and Cornwall ; see Engl. 

 Bot. 



Annual. June, July. 



Root fibrous, smooth. Stem a yard high. Leaves more or less 

 glaucous, rough to the touch. Stipula short. The whole habit 

 of the plant resembles A. sativa, or Common Cultivated Oat, 

 except the panicle, which in A. strigosa is more oblong and uni- 

 lateral, less diffuse j and the florets are essentially characterized 

 by a pair of terminal straight awns to the outer valve, besides 

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

 same valve is moreover sometimes hairy. Thejlorets, naturally 

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

 cond floret, has a lateral tuft of hairs near the top. 



3. A. pubescens. Downy Oat-grass. 



Panicle erect, nearly simple. Florets about three, longer 

 than the calyx. Partial stalk bearded. Leaves flat, 

 downy. Root somewhat creeping. 



A. pubescens. Linn. Sp. PI. 1665. Willd. v. 1. 448. Ft. Br. 140. 



Engl. Bot. v. 23. t. 1 640. Knapp t. 90. Hook. Scot A3. Sincl. 1 67. 



Schrad. Germ. v. 1 . 382. Leers 43. t. 9.f. 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. 149S. Hall. Hist. v. 2. 234. 

 Gramen avenaceum 7 , seu glabrum (potius hirsutum) panicula 



purpuro-argentea splendente. Raii Syn. 406. t. 21 ./. 2. ed. 2. 



262. n. 10 j see also p. 252 * 345. 

 G. avenaceum, panicuia purpuro-argentea splendente. Scheuchz. 



Agr. 226. L4./.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 1 \ or 2 feet high, simple, straight, except at the lowest 

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

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

 ing hairs. Stipulas 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. 



