398 97. GRAMINEJ2. 



** 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 bifid tip. 

 E. B. 812. P. 24. Avena Koch. St. 61.2 in. high. L. short 

 and narrow. Sheaths roughish 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. prcecox (L.); pan. spikelike oblong, 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. E. 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.flavescens (Beauv.) ; pan. much branched diffuse equal, 

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

 952. St. about a foot high. Radical 1. and sheaths hairy. 

 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 Anglice." Anders. 69. Should be looked for. I 

 cannot obtain information from Sweden.] 



29. AVENA Linn. Oat. 



* Upper gl. 5 ^-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 pale bifid at the end. 

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

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

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



2. A. strigosa (Schreb.) ; pan. secund, spikelets of about 2fl., 

 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-veined. Spikelets erect. Root perennial. 

 Lateral clusters of I. barren. 



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



