m TRIANDR1A.— DIGYNIA. 



1. Corolla unarmed. 



37. PHRAGMITES. Cal. 6— 7-flowered. Florets on 

 villose pedicels, except the lowest, which is sessile 

 and naked at the base ; inferior valve elongated, 

 acuminate and involute ; superior valve somewhat 

 conduplicate. 



G8, GLYCERIA. Spikelets terete, elongated. Cal. 

 many -flowered, shorter than the florets ; inferior 

 valve of the corolla herbaceo-membranaceous ; su- 

 perior valve somewhat conduplicate. Nect. collate- 

 ral, connate. Stig. decompound. 



69. 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. 



70. BRIZA. Spikelets cordate-ovate, many-flowered. 



Cal. paleaceous, shorter than the distichous florets. 

 Cor. ventricose ; inferior valve cordate ; superior 

 nearly orbicular, very short. 



7 1 . 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. 

 a. Seed free. 



72. 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. 



73. URALEPIS. Cal. 2 — 3-flowered, much shorter than 



the florets, which are stipitate and distinct. Cor. 

 2-valved ; valves very unequal, distinctly villose on 

 the margin ; the inferior tricuspidate ; the central 

 cusp produced into a short bristle ; superior valve 

 concave on the back, and incurved. Seed gibbous., 

 coated. 



74. TR1CUSPIS. S/n'fce/efs terete, tumid, many-flowered. 



Calyx 2-valved, carinate, shorter than the florets. 

 Inferior valve of the Cor. tricuspidate by the pro- 

 jecting carina and margins ; base and sides villous ; 

 superior valve emarginate. Nect. obtuse, entire, 



