138 



CONTRIBUTIONS FROM THE NATIONAL H KRBARIUM. 



Guanajuato: Acambaro, Hitchcock 0946. Irapuato, Hitchcock 7:i93. 



Michoacan: Morelia, Arsene in 1909. 



Mexico: Valley of Mexico, Pringle 8622; Berlandier 730; Karwinsky in 1K07. Tulu, 



Hoi way 9. 

 Guatemala: Estanzuela, Heyde & Lux 3911. 



5. Echinochloa walteri (Pursh) Heller. 



Panicum hirtellum Walt. Fl. Carol. 72. 1788. Not Panicum hirlellum L. 1759. 

 Type locality, South Carolina, no definite station given. There are three specimens 

 in Walter's herbarium at the British Museum. 1 One of these is the species described 

 below under Echinochloa walteri. This specimen may be taken as the type, as this 

 preserves the name in its usual application. 



Panicum walteri Pursh, Fl. Amer. Sept. 66. 1814. The range is given as "Near 

 the salt-water: Canada and New York." The species is described as having hispid 



sheaths. The name is founded on P. hir- 

 tellum Walt. 



Panicum crusgalli var. hispidum Ell. Bot. 

 S. c. & Ga. 1: 114. 1816. Based on P. his- 

 pidum Muhl., in manuscript. 



Panicum hispidum Muhl. Descr. Gram. 

 107. 1817. Not Panicum hispidum Forst. 

 1786. "Habitat in Carolina, Delaware, et 

 Nov. Ebor." Panicum hirtellum Wall, ie 

 cited as a synonym . 



Panicum longisetum Torr. Amer. Journ. 

 Sci. 4: 58. 1822. Not Panicum longisetum 

 Poir. 1816. "On the banks of the Fox 

 River," Wisconsin. The type, labeled 

 'Cass's Exped. Capt. Douglass," is in the 

 Torrey Herbarium. The sheaths areglabrous, 

 but only the upper part of the plant is shown. 

 Orlhopogon hispidus Spreng. Syst. Yeg. 1 : 

 307. 1825. Based on Panicum hispidum 

 Muhl. 



Oplismenus longisetus Kunth, Rev. Gram. 

 From Chase H26, \ : 45, ig29. Based on "Panicum longis< 

 Torrey." 



Echinochloa walteri Heller, Cat. N. Amer. PI. ed. 2. 21. 1900. Based on Panicum 

 walteri Pursh. 



Echinochloa longiaristata Nash in Small, Fl. Southeast. U. S. 84. 1903. "In wet 

 ground, South Carolina to Louisiana." The type in the Torrey Herbarium was 

 collected in Louisiana by Hale. The sheaths are glabrous, but only the upper 

 part of the plant is shown. m 



DESCRIPTION". 



Plants annual; stems erect, often succulent, often rooting at tbe lower nodes when 

 growing in mud or water, 1 to 2 meters high, as much as 2.5 cm. thick at base, glabrous; 

 sheaths papillose-hispid, or papillose only, sometimes only the lower sheaths hispid 

 or the hairs confined to the marginal region, or sometimes scabrous only, or rarely 

 glabrous, the collar more or less pubescent; ligule wanting, the ligular area often 

 pubescent; blades usually 10 to 15 mm. wide, sometimes as much as 3 cm. wide, 

 mostly scabrous on both surfaces; panicle large and dense, as much as 30 cm. long, 



Fig. 29. — Echinochloa walteri 

 Illinois. 



1 See Hitchcock, The Identification of Walter's grasses. 

 34. 1905. 



Rep. Mo. Bot. Card. 16: 



