1921] Wiegand, — Echinochloa in North America 63 



1910, A. S. Hitchcock, no. 6,946; Valley of Mexico, 1901, C. G. Pringle, 

 no. 8,622; near Morelia, Michoacan, 1909, G. Arsbne, no. 3,079. 



10. E. polystachya (HBK.) Hitchcock, Contr. U. S. Nat. Herb, 

 xxii. pt. 3, 135 (1920). Oplismenus polystachyus HBK. Nov. Gen. 

 et Sp. i. 88 (1815). x Panicum spcctabile Nees, Agrost. Brasil. 262 

 (1829). P. aristatum Macfad. in Hooker's Bot. Misc. ii. 115 (1831). 

 Oplismenus jamaicensis Kunth, Enum. PI. i. 147 (1833). — Swamps 

 and ditches, Mexico (Hitchcock), the West Indies and northern 

 South America to Argentina (Hitchcock). 



Whether the name Oplismenus polystachyus HBK. applies to this 

 species is not entirely clear. Certain characters mentioned in the 

 original description, as lower flower male, glumes hispid, first lemma 

 ovate, paleas two, and ligule pilose, leave no doubt that it belongs to 

 some member of this group of species. However, the foliage is de- 

 scribed as glabrous, but the writer has seen no specimens with gla- 

 brous foliage. Until the accumulation of more material has shown 

 that the name belongs to some seggregate of the present species, 

 it would seem wise to retain the name for the group rather than 

 the next later name, E. spcctabilis (Nees) Link. From the descrip- 

 tion, Panicum aristatum Macfad. would clearly seem to be this spe- 

 cies, though Hitchcock states that the type specimen is E. crusgalli 

 crus-pavonis, which is our E. echinata. In Macfadyen's description 

 the ligule is said to be a line of long hairs, the sheaths ciliato-setose, 

 the culms geniculate at base, 4-5 ft. high, and the leaves a foot long, 

 broad, linear and hispid. 



11. E. guadeloupensis (Hackel) comb. nov. Panicum spcctabile 

 var. guadcloupense Hackel, Notizbl. Bot. Gart. Berlin, i. 328 (1897). 

 E. pyramidalis Hitchcock & Chase, Contr. U. S. Nat. Herb, xviii. 

 pt. 7, 345 (1917) and Hitchc, ibid. pt. 3, 134 (1920), not P. pyra- 

 midale Lam., Tab. Encyc. i. 171 (1791) and Encyc. iv. 735, misprinted 

 745 (1796).— Island of Guadeloupe: P. Duss, no. 3,920 (Hackel's 

 type specimen was Duss, no. 3,176). 



Hitchcock and Chase (1. c.) credit E. pyramidalis (Lam.) Hitchc. 

 & Chase to Guadeloupe as introduced from Africa, the type station 

 being Senegal, and say that it is the same as Panicum spcctabile var. 

 guadeloupensis Hackel, which was based on a collection made in 

 Guadeloupe by Duss. However they do not state on what ground 

 it is assumed to have been introduced. There is in the Gray Her- 

 barium a specimen of Echinochloa from Guadeloupe collected by 



1 The first volume of Humboldt's work in the library of Cornell University bears 

 the date 1815, and the above species is described on p. 88, not on p. 107 in 1816 as 

 frequently cited. 



