FESTUCEiE. G()9 



3. Zeobromns Griseb. — spikelets usually broad and thick, the 

 floral glume awued, and the nerves of all the glumes more numer- 

 ous than in the preceding sections. 



4. Ceratochloa D C. (or lieauv.). — spikes flat, not unlike those 

 of Uniola, but at length often thickened as in Zeohromus, floral 

 glume scarcely notched at the end, and the awn very short. 



The following artificial key maybe found easier for the student 

 than the sections above named: 



A. Panicle densely obovate-cuneate 1 



B. Panicle otherwise than the above (a) 



a. Floral glume 22-27 mm. long, awn 35-45 mm. long . 2 



a. Floral glume about 20 mm. long, awn 4-8 mm. long. 3^ 



a. Floral glume shorter (b) 



b. Panicle 5-10 cm. long; floral glume about 18 mm. 



long, awn 20-25 mm. long 4 



b. Panicle 13-18 cm. long; floral glume 9-10 mm. 



long, awn very short or 5^ 



b. Panicle 15-18 cm. long; floral glume 11 mm. long. S 

 b. Panicle 15-25 cm. long; floral gume 16-19 mm. 



long, awn 20-30 mm. long 7 



b. Panicle 15-30 cm. long; floral glume 15-17 mm. 



long, awn 5-12 mm. long 8 



b. Panicle about 30 cm. long; floral glume about 14 



mm. long, awn 5 mm. long 9 



b. Panicle 8-18 cm. long; floral glume 10 mm. long, 



awn 3-5 mm. long. 10 



b. Panicle 5-15 cm. long; floral glume 13 mm. long, 



awn 4-6 mm. long 11 



b. Panicle al)Out 30 cm. long; floral glume about 



10-14 mm. long, awn 20 mm. long. Var. inajor. 10 

 b. Panicle 15-20 cm. long; floral glume 12-18 mm. 



long, awn 2-4 mm. long 12 



b. Plant otherwise than those above (c) 



c. Branches of panicle drooping; spikelets smooth, 

 flat, oval; floral glume broad-ovul, awn 1 mm. 

 louir or less 13 



