372 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
KEY TO THE SPECIES. 
Annuals. 
Pods twisted; all joints except the terminal one pubescent; 
leaflets broad... ..22..22-22 eee eee eee eee cee ee eee 1. M. bigelovit. 
Pods straight; all joints glabrous or nearly 60; leaflets narrow.. 2. M. neomericana. 
Perennials, 
Loments glabrous...............22 222 eee ee ee eee eee cee eee 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. M. arizonica. 
1. Meibomia bigelovii (A. Gray) Kuntze, Rev. Gen. Pl. 1: 197. 1891. 
Desmodium bigelovii A. Gray, Pl. Wright. 2: 47. 1853. 
Desmodium spirale bigelovit Robins. & Greenm. Proc. Amer. Acad. 29: 385. 1894. 
TypE Locaity: 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. Meibomia neomexicana (A. Gray) Kuntze, Rev. Gen. Pl. 1: 198. 1891. 
Desmodium neomexicanum A. Gray, Pl. Wright. 1: 53. 1852. 
Desmodium exigquum A. Gray, Pl. Wright. 2: 46. 1853. 
Type Locaity: Mountain valley 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. Meibomia batocaulis (A. Gray) Kuntze, Rev. Gen. Pl. 1: 197. 1891. 
Desmodium batocaulon A. Gray, Pl. Wright. 2: 47. 1853. 
Type Locauity: Stony banks of small streams, on the San Pedro, Sonora. 
Ranae: New Mexico and Arizona to Mexico. 
New Mexico: San Luis Mountains ( Mearns 2138). 
4. Meibomia grahami (A. Gray) Kuntze, Rev. Gen. Pl. 1: 198. 1891. 
Desmodium grahami A. Gray, Pl. Wright. 2: 48. 1853. 
TYPE LOCALITY: On mountains, near the Copper Mines, New Mexico. Type col- 
lected by Wright (no. 1015). 
Rance: 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. 
5. Meibomia metcalfei Rose & Painter, Bot. Gaz. 40: 144. 1905. 
Type LocaLiry: Animas Creek in the Black Range, Grant County, New Mexico. 
Type collected by Metcalfe (no. 1137). 
RanaeE: Southwestern New Mexico. 
New Mexico: Animas Creek; Pine Cienaga. 
6. Meibomia arizonica (8S. Wats.) Vail, Bull. Torrey Club 19: 117. 1892. 
Desmodium arizonicum 8. Wats. Proc. Amer. Acad. 20: 363. 1885. 
TYPE LOCALITY: Arizona. 
Ran@eE: Arizona and New Mexico to Mexico. 
New Mexico: Mogollon Mountains. 
