1 68 Graminese. 



XVIU.—A//^A. 



Spikelets laterally compressed 2-flowered in panicles, empty glumes 2 

 membranous I -nerved, outer palea mem.branous 3-nerved awned at the back, 

 awn usually bent in the middle, inner palea bifid 2-nerved, stamens 3. 



Inner palea truncate toothed, 647 



Inner palea bifid, 648 



647 Leaves flat, awn short straight, 



647 Leaves setaceous, awn long bent, . 



648 Panicle very spreading, .... 



648 Panicle compact spike-like. 



A. c8espitosa. 



A. flexuosa. 



. A. caryophylka. 



A. prsecox. 



AIR'A CiESPITO'SA (in). Tufted Hair-grass. 7—8. Leaves flat 

 (1673) rough at the edge densely tufted, panicles 4 — 8 in. nodding, branches 



slender rough, spikelets \ in. shining much compressed, awn short. 



Wei pastures. 



AIR'A FLEXUO'SA (105), Waved Hair-grass. 6—7. Leaves filiform, 

 (1676) stem I — 2 ft. slender erect smooth, panicle 2 — 5 in. spreading with 



wavy very slender branches, awn half as long as the spikelets. Dry 



woods. 



AIR'A CARYOPHYL'LEA (105). Silver Hair-grass. 6—7. Leaves 

 {1670) short setaceous, stem 6 — 9 in., panicle silver-grey i — 2 in. spreading, 

 awn twice as long as its glume twisted. Sandy meadows. 



AIR'A PRiE'COX (108), Early Hair-grass. 5-6. Stem I— 4 in., 

 (1671) leaves few setaceous, panicle ^ in, contracted with few pale-green 

 spikelets, awn longer than the glume. Dry pastures. 



XIX.— ^ VENA. 



Spikelets large laterally compressed in loose panicles 2- or many-flowered, 

 upper florets usually imperfect, empty glumes 2 membranous equalling the 

 flowering glumes, outer palea bifid with a long bent and twisted awn. 



Spikelets erect, 649 



Spikelets drooping, 651 



649 Radical leaves glabrous, .... A. pratensis. 



649 Radical leaves hairy, 650 

 650 Panicle nearly simple, ...... A. flavescens. 



650 Panicle much-branched, 



651 Spikelets 2-flowered, . 

 651 Spikelets 3-flowered, . 



A. pubescens. 



A. strigosa. 



A. fatua. 



AVE'NA STRIGO'SA. Stem 1—2 ft. slender, spikelets drooping 2-flowered 

 (1682) empty glumes 7 — 9-nerved, glumes and pedicels glabrous, flowering 

 glume bifid, segments awned. [Wl. 



