10 TRIANDRIA DIGYNIA. [CI. 3. 



49. SP ARTl'N A. Cal. of 2 lanceolate, compressed, clasping valves. 



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



Nect. 0. Seed loose. Styles combined. 

 53. STlPA. 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 



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



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



awnless valves. Cor. of 2 unequal, depressed, awnless valves. 

 Seed coated with the hardened corolla. 



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



** Fl. dispelled. Cal. of '2 valves, containing 2 or 3 florets. 



39. AlRA. Florets 2, without any intermediate rudiment. Seed 



loose. Cor. unchanged. 



42. MeLICA. Florets 1 or 2, with the rudiments of I or 2 



intermediate ones. Seed coated with the hardened corolla. 



40. HoLCUS. One floret barren. Cor. awned. Seed coated with 



the hardened corolla. Cal. keeled. 



38. PANICUM. One floret neuter : cor. of the perfect one 



awnless. Seed coated with the hardened corolla. Cal. ribbed. 

 14. HIER6CHLOE. Florets 3; central one perfect, with 2 

 stamens; lateral ones barren, with 3. Cor. membranous, 

 unchanged. Seed loose. Styles distinct. 



43. SESLeRIA. Florets 2 or 3, all perfect. Outer valve of the 



corolla toothed ; inner cloven. Seed loose. Styles combined. 



*** Fl. dispersed. Cal. containing many florets. 



47. BRlZA. Cor. awnless, tumid, expanded, concave, without a 



keel. Seed depressed, united to the corolla. 

 45. PoA. Cor. awnless, compressed, keeled, ovate, acute. Seed 

 loose, elliptic-oblong. 



44. GLYCeRIA. Cor. awnless, cylindrical, furrowed, ribbed, 



abrupt, not keeled. Seed loose, cylindric-oblong. 

 43. TRIoDIA. Cor. orbicular, expanded, obscurely ribbed, deeply 

 cloven, with an intermediate point; both valves concave. 

 Seed loose, depressed. 



48. DaCTYLIS. Cor. awned at the summit, lanceolate, keeled, 



compressed ; inner valve folded, 2-ribbed. Seed loose, oblong. 

 Cal. compressed, taper-pointed, unequal. 



51. FESTuCA. Cor. awned at the summit, or pointed, keeled, 

 nearly cylindrical, concave ; inner valve flat, 2-ribbed, downy 

 at the ribs. Seed loose, oblong. Cal. concave, acute, very 

 unequal. 



50. CYNOSuRUS. Cor. awned at the summit, lanceolate, keeled, 

 concave ; inner valve flat, 2-ribbed. Seed loose, elliptic- 

 oblong. Cal. awned, equal. Spikelets in pairs ; 1 entirely 

 neuter. 



