TRIAND^IA DIGYNIA. 



c. Corolla with one or two abortive rudiments ofjlorets at the hise. 

 Glume and corolla of nearly similar texture. 



44. PHALARIS. cal. 1-flowered, 2-valved, nearly equal, membranace- 

 ous, gibbous on the back, carinate; cor. 2-valved, coriaceous, hairy 

 at the base, shorter than the calyx. Rudiments opposite, sessile, re- 

 sembling valves. Nect. collateral. 



45. ANTHOXANTHUM. cal. 2-valved, 1-flowered ; cor. 2-valved 

 with two abortive, 1-valved rudiments at the base ; one of them 

 awned from near the base, the other from near the tip. Stam. 2. 



46. BRACHYELYTRUM. cal. very minute ; inferior glume scarcely 

 perceptible ; cor. with the inferior valve terminating by a long bristle : 

 superior valve with a clavate rudiment at the base. 



tt Spikelets many-Jlowered. 

 * Florets all perfect, 

 a. Flowers panicled. 

 1. Corolla unarmed. 



47. PHRAGMITES. Calyx 5^7-flowered. Florets on villose pedi- 

 cels, except the lowest, which is sessile and naked at the base ; infe- 

 rior valve elongated, acuminate, and involute ; superior valve some- 

 what conduplicate. 



48. GLYCERIA. .Spikelets terete, elongated; cal. many-flowered, 

 shorter than the florets ; inferior valve of the corolla herbaceo-mem- 

 branaceous ; superior valve somewhat conduplicate. Nect. collateral, 

 connate. Stif* decompound. 



49. UNIOLA. Spikelets compressed, ancipital, many-flowered ; cal. 2- 

 valved, shorter than the florets ; cor. 2-valved, awnless ; inferior 

 valve boat-shaped ; superior valve smaller, concave on the back, 

 Nect. collateral, emarginate. 



50. BRIZA. Spikelets cordate-ovate, many-flowered ; cal. paleaceous, 

 shorter than the distichous florets ; cor. ventricose ; inferior valve 

 cordate ; superior nearly orbicular, very short. 



51. POA. Spikelets oblong or linear, compressed, many-flowered ; cal. 

 shorter than the florets ; cor. herbaceous, awnless, often arachnoid at 

 the base ; inferior valve scarious on the margin. 



2. Corolla more or less setigerous or mucronate. 



52. KCELERIA. cal. 2 4-flowered, shorter than the florets. Inferior 

 valve of the corolla mucronate, or with a short bristle a little below 

 the tip. 



53. FES TUG A. Spikelets often more or less terete, at length compress- 

 ed, many-flowered ; calyx unequal, carinate, shorter than the florets ; 

 corolla somewhat terete ; superior valve acute, mucronate, or with a 

 short bristle at the tip ; superior valve bidentate. 



54. DACTYLIS. Spikelets aggregated in a unilateral head, many- 

 flowered ; calyx snorter than the florets ; one of the glumes larger, 

 carinate and pointed. Inferior valve of the corolla carinate, emargi- 

 nate, mucronate ; superior valve somewhat conduplicate. 



3. Corolla more or less bifid, armed between the divisions, a little below 

 the tip. 



55. DANTHONIA. calyx 2 5-flowered, longer than the florets; 



