Chase — Notes on Genera of Panicees. IV. 157 



PL 3 : 1077, 1104. 1883) recognizes Chaetium as a valid genus, as does 

 Hackel (Engler & Prantl, Pflanzenf. 2' 2 : 33, 36. 1887) both placing it 

 immediately after O/dismenus. 



Hemsley (Biol. Cent. Amer. Bot. 3 : 503. 1885) transfers Berchtoldia 

 bromoides to Chaetium giving Bentham as authority with a reference to 

 the Linnaean Society's Journal mentioned above, but Bentham did not 

 there transfer the species. 



Fournier (Mex. PI. 2 : 40. 1886) gives Berchtoldia as a genus, including 

 in it Presl's species, and also two species of Echinochloa. 



Description. — Inflorescence a dense, narrow panicle; spikelets short- 

 pediceled, dorsally compressed, lanceolate and having a long, slender 

 callus-like base from the elongation of the joint of the rachilla between 

 the glumes, the bearded base of the first glume adnate to it; glumes bear- 

 ing awns 3 to 4 times the length of the body of the spikelet, the first 

 reduced to the awn or, in C. bromoides, the pair broadened and enclosing 

 the rest of the spikelet ; sterile lemma bearing a shorter awn or awn-tipped 

 only, the sterile palea obsolete ; fruit subindurated, lanceolate, the lemma 

 acuminate into a scabrous awn or point, the thin margins flat, the sum- 

 mit of the palea not enclosed. Perennials with long, narrow leaves; the 

 genus containing but three known species, one of Mexico and Central 

 America, one of Cuba, and one of Brazil. 



29. Genus TRICHOLAENA Schrad. 



Tricholaena Schrad. in Schult. Mant. 2 : 163. 1824. Three species are 

 included in the genus but the second and third are preceded by a ques- 

 tion mark, hence the first, T. micraniha Schrad., of which Saccharum 

 teneriffee is given as a synonym, is the type. . 



Rhynchelytrurn Nees in Lindley, Nat. Syst. ed. 2. 446. 1836. The genus \//p//lsU 

 is described and a single species, R. dregeanum, given. We have not 

 seen the type specimen but the generic description applies to Tricholaena. 

 Stapf (Dyer. Fl. Cap. 7 : 444. 1898) refers R. dregeanum to T. rosea Nees. 



Monachyron Pari, in Hook. Niger Fl. 190. 1849. A single species, M. 

 villosum, is included. The type specimen has not been examined. Hackel 

 (Engler & Prantl, Pflanzenf. 2' 2 : 36. 1887) gives this as a synonym of 

 Tricholaena, and Durand and Schinz (Consp. Fl. Afr. 5 : 771. 1895) trans- 

 fer 3/. rillosum to this genus. Making allowance for a misunderstanding 

 of the structure of the spikelet, owing to the remote first glume, the de- 

 scription applies to Tricholaena. 



The scarcely indurated fruit, scarcely firmer than the usually 2-lobed 

 and awned second glume and sterile lemma, together with the elongation 

 of the rachilla joint between the glumes, serve to distinguish this Old 

 World genus, a single species of which, T. rosea Nees, is sparingly escaped 

 from cultivation in the tropics and siibtropics of North America. 



30. Genus CORIDOCHLOA Nees. 



Coridochloa Nees, Edinb. New Phil. Journ. 15 : 381. 1833. This genus 

 is based on a single species, " Coridochloa * * * cujus typus est 



