134 77.Aira. 10. GRAMINEJE. PL end, ph. 



Gramen avenaceum q. Gramen parvum praecox, panicula (potius spica) 

 laxa canescente. Rail Syn. 407, 10. 

 Aira prfecox, Lin, S. P 97. 

 Avena praecox, Pal. de Beauvois. 

 Avena pusilla, Web. Holsat. 9. 



Barren sandy places ; annual ; May and June. 

 Culm erect, 3 in. high, very smooth^ pale green ; shealks 

 inflated, angular, smooth ; panicle erect ; locustce. upright. 



2. A'lra caryophyllea. Clove hairgrass. 

 Panicle diverging, S-forked; pedimcles rather straight; 



lase of the spathellules rather naked ; awn scarcely longer 



than the glumes ; Ugula long, acute. 



Gramen avenaceum q. Gramen paniculatum locustis parvis purpuro- 

 argecteis annuum, Raii Syn. 407, 7. 

 Avena caryophyllea, Lin. S, P. 97. 



Sandy places ; annual ; July. 



Ctdm branched at bottom, leafy; sheaths slightly striated; 

 panicle 3 or 4-forked ; locustce small, silvery purple. 



b. Spathelles unequal ; spathellules awned at the lase ; 

 Jlowrets pedicelled ; perennial. 



3. Aira flexuosa. Bent hairgrass. 

 Leaves long, bristlelike, smooth; Ugula short, blunt; 



panicle expanding ; peduncles in pairs, flexuose ; awn 

 double the length of the spathellules ; spathellules toothed, 

 spinous. 



Gramen avenaceum q. Gramen paniculatum locustis parvis, purpuro. 

 argenteis, majus et perenne Doody, Raii Syn, 407,8. 

 Aira iiexuosa, Lin. S. P. 96. 



Wet mountainous places ; perennial ; June, July. 



Roots in tufts; cubn 18 in. high, smooth, round, nakedish; 

 leaves radical, fascicled, smooth, shorter than the culm; 

 sheaths rough ; locustce small, whitish, 



4. Aira setacea. Bristly hairgrass. 



Leaves short, bristlelike, rough ; Ugula long, acute ; pa- 

 nicle rather contracted; peduncle becomes flexible; awn 

 double the length of the spathellule; spathellules iooihed, 

 spinous. 



Aira se'acea, Tluds. Fl. Angl. ed, I. 

 Aira fl/xnosa jS, Smith FL JBnt. 85. 

 Aira moiit-ui i, fVilld. Sp. PI. 1,319. 

 Av-na montana, Web. Jlolsnt. 9 ? 

 Aira >icabroseiacea, KnappGram. 32. 



Woods and heaths ; perennial ; July. 



