AGUOSTIDE.E. 391 



a. Awn littli' oi .lot exsurti-d. (b) 



f. Piiiiiclc siiii|ile, hraiu'lics rapilhiry, awn usually 



slightly projoctiug, culms with few leaves ... 

 uiul possibly some of 10, 11 



f. Panicle spikelike 10 



B. Floret awnless (b) 



b. Si)ikelet less than "Z mm. long (rarely "i in no., 18) . (g) 



g. Panicle narrow, thin, purple, emi»ty glumes and 

 floral glume reaching to the same height. . . . 15 



g. Panicle with long capillary rays, flower-bearing only 



near the ends, sometimes plants of 11 



g. Panicle dense, usually pale green 17 



b. Spikelet 2-4 (very rarely less than 2) mm. long. . . (h) 

 h. Panicle dense, somewhat lobed, nsually pale green, 



ligule 3-5 mm. long 17 



h. Panicle not dense, though sometimes s^imple. . . (i) 

 1. Panicle 3-8 cm. long, purple. ...... (j) 



j. lilades involute IS 



J. Blades flat 20- 



i. Panicle of well-grown plants more than 8 cm. 



long (k) 



k. Palea 1.3-2.3 mm. long, as long as its glume. (1) 

 1. Ligule 3-5 mm. long, rays 8-15. . . .21 

 1. Ligule 3-5 mm. long, rays 15-25, panicle 



denser, 15-25 cm. long. 22 



k. Palea or minute (m) 



m. I'anicle light green, rays erect, spikelet 



2-2.5-3 mm 13, 14 



m. Plant 30-60 cm. high (n) 



n. Panicle pale green, 10-18 cm. long, 



flower-bearing from near the middle. 12 

 n. Panicle simple, thin, rays flower- 

 bearing near the tips (o) 



o. Panicle 10-12 cm. long. . . . 23 

 o. Panicle 20-30 cm. long, possibly 

 some of 10 



