628 POACEiE. 



C. Ligule 1-1.5 mm. loug, rays 4-7 (d) 



d. Floral glume 3.5-4 mm. loug 11 



d. Floral ghune 2.5-3 mm. long 12 



C. Ligule 1-3 mm. long, rays 2-3, floral glume 



2.5 mm. long 13 



c. Ligule 1.5 mm. long, rays 3-4, floral glume 



3.5-4.5 mm. long 14 



c. Ligule 2 mm. long, floral glume 3-3.5 mm. long 15 

 c. Ligule 2-3 mm. loug, rays 2-3, floral glume 4-5 



mm. long 16 



c. Ligule 2.5-3 mm. long, floral glume 4,2-4.7 



mm. long 17 



C. Ligule 2.5-4 mm. long, rays 2, floral glume 



2.4-4 mm. long 18 



C. Ligule 2-3 mm. long, rays 2, floral glume 3.5- 



4.5 mm. long 1J> 



c. Ligule 3-4 mm. long, rays 2, floral glume 3. 5-4 



mm. loug 20 



C. Ligule 4 mm. long, rays 3-7, floral glume 2.4- 



2.7 mm. long 21 



C. Empty glumes 1-3-nerved, leaves very abruptly 



pointed (o) 



e. Ligule 2-3 mm. long, rays 2, spikolets 

 broadly oval, floral glume 3.5-5 mm. long, 

 no rootstoeks 22 



e. Ligule 1.5 mm. long, rays 3-G, s])ikelets 

 oval or ovate-lanceolate, 3-6-fio\vered, floral 

 glume 3-4 mm. long; creeping vuotstocks. 23 



C. First empty glume 1-3-nerved (a) 



a. Xo running rootstoeks, ligule 1-2 mm. long, rays 2. .1, 22 

 a. No running rootstoeks, ligule 2-3 mm. loug, some- 

 times number 6 



a. lUmuing rootstoeks, ligule 1.5 mm. loug, rays 3-0. . 23 



D. First empty glume 3-nerved (or sometimes 1-nerved in 

 numbers 1, 0. 22, aiul 23). 



s. Annual (?) dwarf (a) 



