20 TRIANDRIA DIGYNIA. [CI. 3. 



Florets lanceolate, rather distant, compressed, downy. Awns 

 shorter than the glumes. Leaves uniform ; lower ones hairy. 

 Moist woods. ©. # . 7. Stem 4—6/ Spihel. linear-oblong, with 

 about 8Jlor. 



9. B. sterilis, 15. 1030. (Barren B.) Panicle drooping*, mostly sim- 



ple. Florets about seven, lanceolate, compressed, seven-ribbed, 

 furrowed. Awns longer than the glumes. Leaves downy. 

 Fields and waste gr. . 6, 7. Hairy. 18 in. Spihel linear- lanceoL 



10. B. didndrus, 14. 1006. (Annual B.) Panicle upright, a little 

 spreading, scarcely subdivided. Florets lanceolate, with two 

 close marginal ribs, and only two stamens. 



Walls and sandy gr. . 6. About 1 /, upright. Spihel erect. 



53. STlPA. Feather-grass. 



1. S. penndta, 19. 1356. (Common F.) Awns feathery. 



Rocky mount., not a native. U . 7. L. upright, long, narrow, 

 acute. Awns 1 f. 



54. AVeNA. Oat, or Oat-grass. 



1. A.fdtua, 31. 2221. (Wild O.) Panicle erect, compound. Spike- 



lets pendulous. Florets about three, shorter than the calyx, 

 bristly at the base, with an oblique scar, all awned. 

 Corn fields. 0. 6 — 8. Leaves rough. Pan. simple. Gl. yellow. 



2. A. strigosa, 18. 1266. (Bristle-pointed O.) Panicle oblong, turned 



to one side. Florets two. Outer valve of the corolla tipped with 

 a double straight bristle. 

 Corn f. . 6 — 8. 3/. glauc. Pan. a little crowded. Awns reddish. 



3. A. pubescens,23. 1640. (Downy O.) Panicle erect, nearly simple. 



Florets about three, longer than the calyx. Partial stalk 

 bearded. Leaves flat, downy. Root somewhat creeping. 

 Past, on chalky soil. If. . 6. Upright. Florets 2, with 1 abort, 

 all on a long, bent partial stalh. 



4. A. pratensis, 17. 1204. (Narrow-leaved O.) Panicle erect, 



with very short simple branches. Florets about five, longer 

 than the calyx. Partial stalks hairy. Leaves involute, naked, 

 finely serrated ; sheaths smooth. 

 Dry chalky past. "U . 7. Upright, smooth. Stip. lanceol. 



5. A. alp'ina, A. planiculmis, 30. 2141. (Alpine O.) Panicle erect, 



slightly branched. Florets about five, longer than the calyx ; 

 partial stalk bearded under each. Leaves flat, minutely ser- 

 rated, naked ; their sheaths rough. 

 Lofty rocks in Scot. 2£. 7. M. jib r. downy. Sheaths long. Fllarge. 



6. A. planiculmis, Suppl. 2684. (Flat-stemmed O.) Panicle erect, 



compound. Spikelets erect, linear-oblong, of from 5 to 7 florets, 

 much longer than the calyx. Leaves scabrous, broadly linear, 

 suddenly acute, minutely serrated. Sheaths flat, shortly cari- 

 nated, scabrous. Lower part of the culm slightly compressed, 

 2-edo-ed. 



