

 Andropogon. triandria digynia. 257 



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 lit- 

 tle more elevated on a common pedicel, expanding ; from 

 two to three inches long. Rachis jointed, winding, and hairy. 

 Flowers in pairs, one sessile, the other pedieelled, both her- 

 maphrodite, and both awned. Calyces two-valved; valve- 

 lets lanceolate, ciliate ; backs smooth, and brown. Carol 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. tridentalus. R. 



Spikes paired, hirsute, both flowers hermaphrodite, and 

 awned. Calyces shaggy, exterior valves cuneate, truncate, 

 tridentate. Coro/s four-valved. 



A delicate, rather tall species; a native of Coromande*. 



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 valves in both flowers cuneiform, 

 with apices truncate, tridentate, back striated ; middle part, 

 as well as the margins from thence down, and the base beard- 

 ed with fulvous hairs ; inner valve longer than the exterior, 

 ending in a pretty long arista ; margins amply fringed with 

 lono- fulvous hairs. Carol in both flowers four-valved ; the 

 exterior one on the inside bifid, and awned. 



9. A. lanceolatus. R. 



Leaves lanceolate, with cordate stem-clasping base, bristle- 

 ciliate. Spikes tern, peduncled. Sessile or hermaphrodite 

 flower awned, with the margin of the exterior valve of the 

 calyx acutely pectinate, serrate. 

 vol. i. Q 



