358 Baldwin on Rotthollia, 



Culm erect, terete, smooth, ramose : leaves very narrow, 

 short : spikes cylindrical upon long terete peduncles, solitary 

 and terminal, calyx 2-valved, the margin of the exterior valve 

 ciliate : corolla 2-valved. 



Root perennial. Culm two to four feet high, generally ra- 

 mose, solid, and terete, except that between the joints where 

 the branches originate, it is grooved on the inner side, and of- 

 ten ciliate on its angles near the joints. The branches origi- 

 nate towards the extremity, commonly from two to three in 

 number, each supporting a single terminal spike. Leaves very 

 narrow, acute, comparatively short, those beneath much the 

 longest, rigid, somewhat involute, and sharply serrulate to- 

 wards the apex. Sheaths rather shorter than the internodes, 

 open to the base, but closely embracing the culm. Spikes 3 to 

 5 inches long, the peduncles clothed with a very delicate acute 

 pointed sheath, which embraces it so closely as almost to elude 

 observation, varying much in length, but seldom extending to 

 the base of the spike. Peduncles scabrous near the spike. 

 Flowers alternate, the male or neutral florets situated on one 

 side of the rachis. Rachis compressed, slender, flexuous, 

 hairy on its exterior surface. Pedicel of the neutral florets 

 also compressed, and hairy on its exterior surface. Valves of 

 the calyx nearly equal, lanceolate, acute, coriaceous, pohshed, 

 the inner margin of each inflected. The exterior margin of 

 the outer valve finely ciliate towards the apex. Valves of the 

 corolla lanceolate, acute, membraneous, nearly the length of 

 the calyx. The male or neutral, are rather smaller than the 

 hermaphrodite flowers. Stamens 3, very short. Anthers twin, 

 purple. Styles 2, excerted, plumose, dark brown. 



Discovered in flat pine barren on the north side of Satilla 

 river, in Georgia, on the 21st of October, 1815. 



GENERAL OBSERVATIONS. 



These plants are unquestionably allied to andropogon in 

 their mode of flowering, but have nevertheless suflicient essen- 

 tial characters to distinguish them. In habit, they appear but 

 slightly similar. They differ principally from their congeners 



