372 CONTEIBUTIONS FEOM THE NATIONAL HEKBAEIUM. 



KEY TO THE SPECIES. 



Annuals. 



Pods twisted; all joints except the terminal one pubescent; 



leaflets broad 1. M. bigelovii. 



Pods8traiglit;all joints glabrous or nearly so; leaflets narrow.. 2. M. neomexicana. 

 Perennials. 



Loments glabrous 3. M. batocaulis. 



Loments pubescent. 



Leaflets ovate to orbicular, obtuse 4. M. grahami. 



Leaflets lanceolate to linear, acute or acutish. 



Leaflets glabrous and shining above, lanceolate; 



stems glabrous. •. 5. M. metcalfei. 



Leaflets densely pubescent above, linear to linear- 

 oblong; stems pubescent 6. if. arizonica. 



1. Meiboroia bigelovii (A. Gray) Kuntze, Rev. Gen. PI. 1: 197. 1891. 

 Desmodium bigelovii A. Gray, PI. Wright. 2: 47. 1853. 



Desmodium spirnle bigelovii Robins. & Greenm. Proc. Amer. Acad. 29: 385. 1894. 

 Type locality: Valley on the San Pedro, Sonora,. 

 Range: Southern New Mexico and Arizona to Mexico. 



New Mexico: Mangas Springs; Black Range; San Luis Mountains; Organ Moun- 

 tains; Gila Hot Springs. Dry hillsides, in the Upper Sonoran Zone. 



2. Meiboroia neomexicana (A. Gray) Kuntze, Rev. Gen. PL 1: 198. 1891. 

 Desmodium neoviexicanwn A. Gray, PL Wright. 1: 53. 1852. 

 Desmodium exiguum A. Gray, PL Wright. 2: 46. 1853. 



Type locality: Mountain A^alley 30 miles east of El Paso, Texas. 

 Range: Western Texas and southern Arizona to Mexico. 



New Mexico: Pinos Altos Mountains; Burro Mountains; Mogollon Mountains; San 

 Luis Mountains; Organ Mountains. Dry rocky hills, in the Upper Sonoran Zone. 



3. Meibortda batocaulis (A. Gray) Kuntze, Rev. Gen. PL 1: 197. 1891. 

 Desmodium batocaulon A. Gray, PL Wright. 2: 47. 1853. 



Type locality: Stony banks of small streams, on tlie San Pedro, Sonora. 

 Range: New Mexico and Arizona to Mexico. 

 New Mexico: San Luis Mountains (Mearns 2138). 



4. Meiboinia grahami (A. Gray) Kimtze, Rev. Gen. PI. 1: 198. 1891. 

 Desmodium grahami A. Gray, PL Wright. 2: 48. 1853. 



Ti'PE locality: On mountains, near the Copper Mines, New Mexico. Type col- 

 lected by Wright (no. 1015). 



Range: Western Texas to southern Arizona, south into Mexico. 



New Mexico: Mangas Springs; Fort Bayard; Mogollon Mountains; San Luis Moun- 

 tains; Kingston; Organ Mountains. Dry hills and canyons, in the Upper Sonoran 

 Zone. 



6. Meibomia metcalfei Rose & Painter, Bot. Gaz. 40: 144. 1905. 



Type locality: Animas Creek in the Black Range, Grant County, New Mexico. 

 Type collected by Metcalfe (no. 1137). 



Range: Southwestern New Mexico. 



New Mexico: Animas Creek; Pine Cienaga. 



6. Meibomia arizonica (S. Wats.) Vail, Bull. Torrey Club 19: 117. 1892. 

 Desmodium arizonicum S. Wats. Proc. Amer. Acad. 20: 363. 1885. 

 Type locality: Arizona. 

 Range: Arizona and New Mexico to Mexico. 

 New Mexico: Mogollon Mountains. 



