39 



Order II. DIGYNIA. Pistils 2. True 

 Grasses, Grajiiina^ 



* Floxvers dispersed. Cal. of 2 or 3 valves^ •with a so- 

 litary jloret, 



31. ALOPECURUS. Cal. of 2 valves. Cor. of 1 valve; 



simple at the summit; awned at the base. Styles com- 

 bined. 



32. KNAPPIA. CaZ. of 2 valves. Cor. of 2 unequal, very 



hairy, awnless valves. 



30. PHLEUM. Cal. of 2 close, parallel, pointed valves, 

 concealing the cor. of 2 awnless valves. Seed loose. 



29. PHALARIS. Cal. of 2 close, parallel valves, con- 

 cealing the double cor. of 3 or 4 valves ; 2 innermost 

 downy, subsequently hardened, investing the seed. 



33. POLYPOGON. Cal. of 2 valves, awned at the sum- 



mit, concealing the cor. of 2 valves; the outermost 

 with a terminal a'wn. Seed loose. 



34. MILIUM. Cal. of 2 tumid, close valves, inclosing 



die cor. of 2 valves. &et? coated with the hardened 

 corolla. 



35. AGROSTIS- Cal. of 2 acute valves, shorter than the 



cor. whicli is membranous, tufted with hairs at the 

 base, unchanged. Seed loose. 



36. CYNODON. Cal. of 2 lanceolate, acute, spreading, 



equal valves, shorter than the co7: of 2 compressed, 

 very unequal valves. Seed coated with the hardened 

 corolla. 



49. SPARTINA. Cal. of 2 lanceolate, compressed, clasp- 

 ing valves. Cor. of 2 compressed, rather unequal, 

 lanceolate valves. Nect. none. Seed loose. Styles 

 combined. 



53. STIPA. Cal. of 2 lax, pointed, awnless valves. Cor. 

 with a terminal spiral awn, jointed at the base. 



55. LAGURUS. Cal. of 2 fringed valves, with terminal, 

 feathery axvns. Outer valve of the cor. with 3 awns. 



37. DIGITARIA. Cal. of 2 or 3 very unequal, close- 



pressed, awnless valves. Co7: of 2 unequal, depressed, 

 awnless valves. Seed coated with the hardened corolla. 

 Arundo 2, 3, 4, 5. McUca 1 . 



