398 97. GRAMINE^E. 



** Lower pale bifid. Nut adnate to the pales, "furrowed on 

 the back." Airopsis Fries. 



4. A. caryophyllea (L.) ; pan. spreading triply forked, spike- 

 lets rounded below, awn from below the middle of the pale and 

 extending considerably beyond its attenuate deeply bifi<l tip. — 

 E. B. 812. P. 24. ^u'etta'Koch.— St. 6— 12 in. hig;h. L. short 

 and narrow. Sheaths rouyhish from below upwards. Spikelets 

 small, rounded below, chiefly collected at the ends of the 

 branches ; no rudiment of a third floret. — Drv gravelly places. 

 A. VI. 



5. A. praicox (L.); pan. spikelike ohlong, spikelets scarcely 

 rounded below, awn from below the middle usually near the base 

 of the pale and extending considerably beyond its attenuate 

 deeply bifid tip.— £. B. 1296. P. 25. ' Avena Koch.— Height 

 1 — 6 in. Pan. close, oval or oblong. No rudiment of a third 

 floret. L. very narrow. — Dry and sandy places. A. IV. V. 



28. Trisetum Pers. 



1. T. ^auescens (Beauv.) ; pan. much branched diffuse equal, 

 gl. very unequal about 3-flowered. — P. 54. Avena Sm., E. B. 

 y52. — St. about a foot high. Radical 1. and sheaths liairy. 

 Spikelets yellowish. Upper gl. oblong-lanceolate, acuminate. 

 Floral axis hairy, hairs short. — Fields. P. VII. 



[T. subspicatum (Fr.) ; pan. spikelike ovate-cylindrical dense. 

 " In alpibus Anglia:." Anders. 69. Should be looked for. I 

 cannot obtain information from Sweden.] 



29. Avena Linn. Oat. 



* Upper gl. 5 — 9-veined. Spikelets ultimately drooping. Root 

 annual. No lateral clusters of leaves. 



1. A.fatua(L.); pan. erect, spikelets of about 3 fl., fl. falling 

 short of the gl. hairy at the base, lower pf le bifid at the end. — 

 E. B. 2221. P. 27.— Height 3 feet. Fl. with long fulvous hairs 

 at their base by which it mav be distinguished from A. sativa, 

 the cultivated Oat.— Corn-fields. A. VII. Wild Oat. 



2. A. strigosa{Schreh.); pan. secund, spikelets of about 2 fl., 

 fl. equalling the gl., lower pale ending in 2 long straight bristles, 

 —E. B. 1266. P. 26.— Height 3 feet. Very like A. sativa, but 

 readily distinguished by the bristles at the end of the fl. — Corn- 

 fields. A. VII. 



** Upper gl. 3-vein,ed. Spikelets erect. Root perennial. 

 Lateral clusters of I. barren. 



3. A. pratensis (L.) ; pan. erect with simple or slightly divided 



