-Andropogo'iu Triandeia digynia. 261 



large, awned valve. — Stamina two, one of the, anthers larger.---^ 

 Germ ovate. — Stijles two. 



7. A. tmtachyos. R. 



Spikes three, both flowers hermaphrodite, and both awned. CaJt/- 

 ces lanceolate, and ciliate. 



A delicate, beautiful species, found on newly laid down pasture 

 ground in the vicinity of Calcutta, and in flower in October, No- 

 vember, and Deceiiiber. 



Annual, with numerous, nearly straight, erect, smooth, slender, 

 pithy culms, of from one to two feet in height. — Leaves taper from 

 the base, most acute, about as long as the joints of the culms ; a 

 few long soft hairs on the inside near the base. — Sheaths smooth, 

 shorter than the joints.— Spikes two, rarely three, and I have not 

 seen four, one sessile the other two a little more elevated on a com- 

 mon pedicel, expanding ; f.om two to three inches long. Rachis 

 jointed. Minding, and hairy.— F/oaws in pairs, one sessile, the other 

 pedicelled, both hermaphrodite, and both awned. — Ca/yces two- 

 valved ; ra/i'e/e/s lanceolate, ciliate; backs smooth, and brown. — 

 Co/o/ of two, small, pellucid, brownish valves, the inner of each, 

 ends in a long, brown arista, proceeding from the bifid apex of the 

 valvelet, 



8. A. tridentatus. R. 



Spikes paired, hirsute, both flowers hermaphrodite, and awned. 

 Calyces shaggy, exterior valves cuneate, truncate, tridentate. Coiols 

 four-valved. 



A dehcate, rather tall species : a native of Coromandel. 



Culms straight. — Leaves small — Spikes terminal, paired, sessile, 

 lanceolate, shaggy. — Flowers in pairs ; one sessile, the other short- 

 pedicelled, both hermaphrodite, and both awned. — Calyx, exterior 

 vaivas in both flowers cuneiform, with apices truncate, triden- 

 tate, back striated ; middle part, as well as the margins from thence 

 down, and the bsse bearded wjith fulvous hairs ; inner valve longer tlian 



