70 CONTKIBUTIONS FROM THE NATIONAL HERBABIUM. 



4. Muhlenbergia gracillima Torr. U. S. Rep. Expl. Miss. Pacif. 4: 155. 1S56. 



Ring grass. 



Type locality: "Llano Estacaclo, and near the Antelope lulls of the Canadian 

 River," Texas or New Mexico. Type collected by Bigelow. 



Range: Colorado and Kansas to Texas and New Mexico. 



New Mexico: Sierra Grande; Nara Visa; El Rito Draw; Las Vegas; Albuquerque; 

 Pecos; Roy; Clayton; Socorro; Santa Fe; Llano Estacado; Mangas Springs; Buchanan; 

 Deniing; Dona Ana; Guadalupe Mountains; Fort Stanton; Gray. Plains and low hills, 

 in the Upper Sonoran Zone. 



This is very common on the plains of the northern part of the State. Its habit of 

 growth is peculiar: the plants are low and form dense circular mats; after a time the 

 center of the mat dies and a sort of " fairy ring" is left. 



5. Mulilenbergia arenicola Buckl. Proc. Acad. Phila. 1862: 91. 1863. 

 Type locality: "Arid places in Western Texas." 



Range: Western TexaB and southern New Mexico. 



New Mexico: Deming; Redlands; Hope; Lake Arthur; Rio San Jose; near Suwanee; 

 Gila Hot Springs; Arroyo Ranch; Jornada del Muerto. Dry hills, in the Lower and 

 Upper Sonoran zones. 



6. Muhlenbergia rigida (H. B. K.) Kunth, Rev. Gram. 1: 63. 1829. 

 PodosaemwnrigidumJI. B. K. Nov. Gen. & Sp. 1: 129. 1816. 

 Type locality: Near Guanajuato, Mexico. 



Range: New Mexico and Arizona to Mexico. 



New Mexico: Five miles east of San Lorenzo on Mimbres River ( Metcalfe 1447). 



7. Muhlenbergia schaffneri Fourn. Mex. PI. 2: 85. 1881. 

 Type locality: "Prope Tacubaya," Mexico. 



Range: New Mexico and Arizona to Mexico. 



New Mexico: Trujillo Creek; Mogollon Creek; Organ Mountains. Dry slopes, in 

 the Upper Sonoran Zone. 



8. Muhlenbergia mexicana (L.) Trin. Gram. Unifl. 189. 1824. 

 Agrostis mexicana L. Mant. PI. 1: 31. 1767. 



Type locality: "Habitat in America calidiore." 



Range: British America to Tennessee and New Mexico; also in Mexico. 

 New Mexico: West Fork of the Gila; Winsors Ranch. Damp ground, in the 

 Transition Zone. 



9. Muhlenbergia racemosa (Michx.) B. S. P. Prel. Cat. N. Y. 67. 1888. 

 Agrostis racemosa Michx. Fl. Bor. Amer. 1: 53. 1803. 



Polypogon glomcratus Willd. Enum. PI. S7. 1809. 



Muhlenbergia glomcrata Trin. Gram. Unifl. 191. 1824. 



Type locality: "Habitat in ripis sabulosis inundatis fluminis Mississippi." 



Range: British America to New Mexico, Missouri, and New Jersey. 



New Mexico: Cedar Hill; Dulee; Las Vegas; Pecos; Raton Mountains; Sandia 

 Mountains; Mangas Springs; Animas Creek; Mesilla Valley; Little Creek; Gilmores 

 Ranch. Damp woods, Lower Sonoran to Transition Zone. 



10. Muhlenbergia comata (Thurb.) Benth. Journ. Linn. Soc. Bot. 19: 83. 1881. 

 Vaseya comala Thurb. Proc. Acad. Phila. 1863: 79. 1863. 



Type locality: " Plains of Nebraska." 

 Range: California to Colorado and New Mexico. 



New Mexico: Winsors Ranch (Standley 4359). Open slopes, in the Transition 

 Zone. 



