172 , Dr. J, J). YlooKEiCs Enumeration of the Plants 



41. P. LONGEPEDUNCULATUM, Lecoute \ Jidc Nees in Herb. Hook., var. foliis 



molliter pubescentibus. 

 Hub. Charles Island, Charles Darwin, Esq. Albemarle Island, Mr. Macrae. 



Culmi subsolitarii, simplices, erecti, 2-3-pedales, glaberrimi. Vaginae internodiis breviores, 

 glabrae, pilosae v. ciliatae. Folia latiuscula, plana, 5-8 unc. longa, ^ unc. lata, utrinque 

 moUiter pubescentia, marginibus ciliatis, basi barbata. Racemus elongatus, 2-5 uncia- 

 lis, spicis 4-8 alternis, patentibus, 1-1| unc. longls ; rachi flexuosa, glabra vel minute 

 scabrida, spiculis angustiore, basi interdum barbata. Spiculae sub 10, geminae, glaberri- 

 mae, late ovato-orbiculatae, y^ unc. longae. Gluma inferior fusco-maculata, S-nervis, nervis 

 2 marginalibus ; superior plana, medio carinata, nervis 2 marginalibus inconspicuis. 



These specimens agree with others from Brazil (Piaiihy, Gardner, n. 2339) 

 except that the vaginae are not so hirsute, a character by no means constant 

 even in the individuals from the latter country. In the 'Flora Brasiliensis' 

 of Martins, Nees quotes the P. longepedunculatuvi as a synonym of P. arena- 

 rium, from which however it remarkably differs in the spikes being more 

 numerous (3-6), the rachis narrower, the spiculae and glumes quite smooth, 

 and in the softly pubescent surface of the leaves, which latter vary much in 

 length and breadth. Our specimens again resemble those of P. supinus, 

 Bosc. (Mart. /. c. p. 53), differing in the culms not being procumbent, and 

 that the glumes are 3- (not 5-) nerved ; and they also resemble P. plicatuhis, 

 Mart. (/. c. p, 67), with the exception of the glumes being all smooth, the 

 lower never undulate, and the flowers much smaller than in any of the 

 numerous authentically named specimens which exist in the Hookerian Her- 

 barium. 



42. Panicum colonum, L. 



Hab. Charles Island, Charles Darwin, Esq. 



43. Setaria Rottleri, Spr. 

 Hab. Albemarle Island, Mr. Macrae. 



These specimens do not differ from East Indian ones. The species is pro- 

 bably of very common occurrence. 



44. Setaria, n. sp. ? A highly remarkable and distinct-looking grass, but in 



too imperfect a state to allow of my pronouncing it absolutely new. 

 Hab. Albemarle Island, Mr. Macrae. 



