FLOWERING PLANTS AND FERNS OF ARIZONA 449 



Graham, Pinal, Cochise, Santa Cruz, and Pima Counties, 3,000 to 

 5,000 feet, mesas and rocky hillsides, March to May (sometimes 

 August), type from the Huachuca Mountains. Southern New- 

 Mexico, southern Arizona, and northern Mexico. 



11. Lotus mearnsii Britton in Greene, Pittonia 2: 144. 1890. 



Hosackia mearnsii Britton, N. Y. Acad. Sci. Trans. 8: 65. 1889- 



Navajo, Coconino, and Yavapai Counties, 3,000 to 7,000 feet, dry 

 mesas and slopes, May to August, type from Fort Verde, Yavapai 

 Comity (Mearns 342). Known only from Arizona. 



12. Lotus oroboides (H. B. K.) Ottlev, Wash. Acad. Sci. Jour. 29: 



4S3. 1939. 



Tephrosia oroboides H. B. K, Nov, Gen, et Sp. 6: 462. 1824. 

 Lotus puberulus (Benth.) Greene, Pittonia 2: 142, 1890. 



Southern Apache County to Cochise, Santa Cruz, and Pima 

 Counties, 5,000 to 7,500 feet, mostly in pine woods, April to September. 

 Western Texas to Arizona and Mexico. 



13. Lotus longebracteatus Kvdb., Torrey Bot. Club Bui. 30: 254. 



1903. 



Hosackia rigida Benth. var. nummularis M. E. Jones, Calif. 



Acad. Sci. Proc. ser. 2, 5: 633. 1895. 

 Anisolotus nummularius Woot. and Standi., Contrib. U. S. 



Natl. Herbarium 16: 135. 1913. 



Coconino and Mohave Counties to Graham, Gila, and Maricopa 

 Counties, 3,500 to 6,000 feet, March to May (sometimes also late 

 summer). Southern Utah and Nevada to New Mexico and Arizona. 



14. Lotus neomexicanus Greene, Pittonia 2: 144. 1890. 



Anisolotus neomexicanus Heller, Muhlenbergia 8: 60. 1912. 



Clifton, Greenlee County {Busby 77), Devils Canyon, Pinal County 

 (Peebles and Harrison 787), about 3,500 feet, February to April. 

 New Mexico and Arizona. 



Apparently rare in this State, and the specimens are not very 

 typical, seemingly approaching L. greenei. 



22. INDIGOFERA. Indigo 



Plant a low shrub, up to 1.2 m. (4 feet) high; herbage canescent 

 with appressed hairs, these attached at the middle; leaves pinnate, 

 the leaflets numerous; flowers in axillary racemes, small; corolla white 

 or pink; pods small, nearly globose, 1-seeded, tardily dehiscent. 



Before the invention of synthetic dyes, the blue dye indigo was 

 obtained in large quantity from Indigojera tinctoria L., an Old World 

 species, and from the Mexican species 7. suffruticosa Mill. Indigo 

 was an important crop at one time in the southeastern United States. 

 Arizona's single native species is browsed but is not abundant enough 

 to be important. It is considered useful for erosion control. 



1. Indigofera sphaerocarpa A. Gray, PI. Wright 2: 37. 1853. 



Cochise and Santa Cruz Counties, 4,000 to 6,000 feet, July to 

 August. Southeastern Arizona and northern Mexico. 



