TRIANDRIA. MONOGTNIA. 31 



spikelets constantly subimbricate. — Calix 2- 

 valved, 1-flowered, the valves unequal. Corol- 

 la 2vaIve(U lai\^er than the calix. Seed tri- 

 quetrous. (^Stamina 1, 2, and 3; stigmas 2, 

 and 3.) 



Flowers capitate, or umbellate-capitate, terminal; in- 

 volucruin of the head or umbell 3, 4, or many-leaved; 

 culm ofien triangular. (According to the observations 

 ofMr. Elliott, in his Sketches of the Botany of South Ca- 

 rolina and Georgia, the X. pnvnla of iVIicH. has no calix, 

 and the K maculata of M. a calix of only 1 leaf) 



Species. 1. monocepliala. 2. piimila. 3. maculata. 



Obs. With the exception of tne species indigenous to 

 the United States, the genus Kylliyig^ia is confined to the 

 tropical regions of India and America. 



45. MAP AN I A. JluUet 



Flowers capitate, subtended by a large, 3- 

 leaved involucrum. — Calix 0. Corolla 6-vaived, 

 valves toothed, and imbricated. Stigmata 3. 

 Seed intimately enveloped by a chaffy 6-parte(l 

 perisporium (or involucellum.) 



Culm triquetrous, sheathed at the base with short squa- 

 mose lanceolate leaves; flowers in a terminal involu- 

 craie capitulum, the involucrum consisting of 3 large 

 white? leaves 



Species. 1. sylvatica. It is extremely doubtful wh.e- 

 ther this singular grass of Guianne has ever yet been found 

 in the United States Mr Kinn, said to have been the dis- 

 coverer by Mr. Pursh, on being ques.ioned regarding it, 

 by my friend Zaccheus Collins, t'.sq. produced the C«- 

 rex Fraseri aa the identical plant shown to Mr. P.; I have 

 been, however, induced to insert it for future examina- 

 tion, as it may probably yet be discovered in some extre- 

 mity of the Southern states. 



46. DICHROMA. Persook. 



Spike capitate, involucrate, squamae or glu- 

 maceous scales on all sides imbricated into ses- 

 sile crowded spikelets, the lower scales empty. 

 ^-Corolla 0. Style setaceous, bifid. Seed with- 

 t)Ut set» (or involucellate filameiits;) somewhat 



