TRIANDRIA.— DIGYNIA, 31 



/3. Seed adnate. 



15. FESTUCA. Spikelets often more or less terete, at 

 length compressed, many-flowered. Cal. unequal, 

 carinate, shorter than the florets. Cor. somewhat 

 terete ; superior valve acute, mucronate, or with a 

 short bristle at the tip ; superior valve bidentate. 



76. CERATOCHLOA. Spikelets lanceolate, subancipi- 



tal, many-flowered. Cal. shorter than the imbri- 

 cated florets. Inferior valve of the corolla com- 

 pressed, mucronate below the tip ; superior valve 

 somewhat conduplicate. Style 2 — 3-parted. 



77. DIARRHENA. Cal. 2-valved, very unequal, 2—5- 



flowered, rigid ; glumes acuminate, mucronate. 

 Cor. cartilaginous ; inferior valve entire, broader ; 

 superior valve much shorter, emarginate. Seed 

 coated, as long as the superior valve of the corolla. 

 Ned. ovate, ciliate. 



78. DACTYLIS. Spikelets aggregated in an unilateral 



head, many-flowered. Cal. shorter than the florets : 

 one of the glumes larger, carinate and pointed. 

 Inferior valve of the cor. carinate, emarginate, mu- 

 cronate ; superior valve somewhat conduplicate. 



). Corolla more or less bifid, armed between the divisions, 

 a Utile below the tip. 



TO. DANTHONIA. Cal. 2— 5-flowered, longer than the 

 florets ; glumes cuspidate. Cor. bearded at the 

 base ; inferior valve 2-toothed, with a twisted awn 

 between the teeth ; superior valve obtuse, entire. 



: J ,0. TRISETUM. Cal. 3 — 5-flowered, membranaceous 

 as long as the florets. Inferior valve of the corolla 

 with 2 bristle-form teeth at the tip, awned below the 

 division of the teeth. 



'. I. BROMUS. Spikelets oblong, distichous, manyi 

 flowered. Cal. shorter than the florets. Inferior 

 valve of the corolla bind, with a bristle between the 

 teeth a little below the tip ; superior valve subcon- 

 iluplicate, ciliate. 



4. Inferior valve of the corolla awned on the back. 

 IRRHENATHERUJf. Cal. membranaceous 



flowered, rather shorter than the florets. Inferior 



