540 GRAMINEA, 
1. p. 203; Fourn. Mex. Pl. Enum., Gram. p. 86; 8. Wats. in Proc. Am. Acad. xviii. 
p. 174. 
Clomena peruviana, Beauv. Agrostogr. p. 28, t. 7. fig. 10. 
Muehlenbergia pusilla, Steud. Gram. p. 177. 
Norra Mexico, San Luis Potosi (Schaffner, 1069) ; Sour Mexico, Toluca (Berlandier, 
1141).—Prrv. Hb. Kew. 
11. Muehlenbergia debilis, Trin. Gram. Unifl. p. 193, et Agrostidea, ii. p. 49; 
Steud. Gram. p. 179. 
Podosemum debile, H. B. K. Nov. Gen. et Sp. i. p. 128, et vii. t. 681. 
Podosemum setosum, H. B. K. loc. cit. p. 129. 
Muehlenbergia setosa, Trin. Gram. Unifl. p. 198; Fourn. Mex. Pl. Enum., Gram. p. 86, cum 
var. B. 
Muehlenbergia microsperma, Trin. ibid.; Fourn. loc. cit. p. 85. 
Trichochloa debilis et T. setosa, Roem. et Schult. Syst. Veg. ii. pp. 385 et 386. 
Trichochloa microsperma, DC. Cat. Monsp. p. 151. 
Agrostis debilis et A. setosa, Spreng. Syst. Veg. i. p. 262. 
Agrostis microsperma, Lagasca, Elench. p. 2. 
Soura Mexico, near Tula, at 6600 feet (Humboldt & Bonpland), Orizaba (Schaffner), 
Ocotlan and San Lorenzo (Liebmann). 
We have followed Trinius in the synonymy of this species, although Fournier treats 
M. setosa and M. microsperma as distinct from M. debilis. 
12. Muehlenbergia distichophylla, Kunth, Enum. PL i. P- 202; Fourn. Mex. 
Pl. Enum., Gram. p. 81. 
Podosemum distichophyllum, Presl, Relig. Henk. i. p. 231. 
Souta Mexico, Dolores, Talea, Micoatlan, and San Andres (Liebmann).—CotomBia. 
Hb. Kew. 
Vasey (‘ The Grasses of the United States,’ p. 23) records this from New Mexico and 
Arizona. 
13. Muehlenbergia dubia, Fourn. Mex. Pl. Enum., Gram. p. 82. 
South Mexico, Chinantla (Liebmann). 
Fournier gives only the following brief description :—“ Vix nota, e culmo tantum 
foliis orbato. Affinis M. mucronate. Panicula angusta, 5-pollicaris ; glume hyaline 
eequales obtuse dimidiam spiculam equantes, palea inferiore brevissime mucronata.” 
14. Muehlenbergia erecta, Presl, Relig. Henk. i. p. 231, non Schreb. 
Mexico (Henke). 
15. Muehlenbergia exilis, Fourn. Mex. Pl. Enum., Gram. p. 84. 
Muehlenbergia tenella, Rupr. in Bull. Acad. Brux. ix. (reprint, p. 4), non Trin. ex Fourn, 
SoutH Mxxico, Jalapa 3000 feet, and Mirador 6500 feet (Galeotti, 5691), Orizaba 
{Botteri, 1207), Consoquitla (Liebmann), barranca near Cuernavaca and Cordova 
(Bourgeau, 1298, 1665). Hb. Kew. 
