522 MISC. PUBLICATION 42 3, U. S. DEPT. OF AGRICULTURE 



5. Poly gala reducta Blake, Gray Herbarium Contrib. 47: 25. 1916. 

 Douglas, Cochise County {Peebles and Leding 5360), 4,000 feet, 



May. Southeastern Arizona and northern Mexico. 



6. Poly gala longa Blake, Gray Herbarium Contrib. 47: 29. 1916. 

 Santa Cruz and Pima Counties, 3,000 to 5,000 feet, spring and 



autumn. Western Texas to southern Arizona and northern Mexico. 

 This species apparently intergrades with P. reducta. 



7. Polygala obscura Benth., PL Hartw. 58. 1840. 



Polygala puberula A. Gray, PI. Wright. 1: 40. 1852. 



Southern Navajo, Graham, Gila, Cochise, Santa Cruz, and Pima 

 Counties, 3,500 to 6,000 feet, often among live oaks, July to September. 

 Western Texas to Arizona and Mexico. 



Arizona's most widely distributed and commonest species. 



8. Polygala orthotricha Blake, Gray Herbarium Contrib. 47: 31. 1916. 

 Chiricahua Mountains (Cochise County), Santa Rita Mountains 



(Pima County), August, type from the Santa Rita Mountains (Pringle 

 in 1884). Known only from southern Arizona. 



The character of the pubescence, alone, seems to differentiate this 

 form from P. obscura. 



9. Polygala rusbyi Greene, Torrey Bot. Club Bui. 10: 125. 1883. 

 Peach Springs to Kingman (Mohave County), also Yavapai County, 



April to July, type from near Prescott. Known only from central 

 Arizona. 



Flowers large and showy for the genus. 



10. Polygala tweedyi Britton in Wheelock, Torrey Bot. Club Mem. 



2: 143. 1891. 



Polygala parvijolia (Wlieelock) Woot. and Standi., Contrib. 



U. S. Natl. Herbarium 19: 392. 1915. 

 Polygala arizonae Chodat, Soc. Phys. Hist. Nat. Geneve Mem. 



31 2 : 108. 1893. 



Huachuca Mountains, Cochise County (Lemmon 2641), Santa Rita 

 Mountains, Pima County, (Pringle in 1884, type collection of P. 

 arizonae), limestone ledges, June. Oklahoma and western Texas to 

 southern Arizona and northern Mexico. 



11. Polygala subspinosa S. Wats., Amer. Nat. 7: 299. 1873. 

 Near Pipe Springs, Mohave County, 5,000 feet (Peebles and Parker 



14714). Western Colorado to northwestern Arizona and southern 

 California. 



The keel is yellow, the other petals purple. 



12. Polygala acanthoclada A. Gray, Amer. Acad. Arts and Sci. Proc. 



11: 73. 1876. 



Monument Valley, Navajo County, in "bad lands" (Turner 16), 

 Lees Ferry, Coconino County (Jones in 1890), south of Marble Gorge, 

 Coconino County (Gunning and Ooodding 2693), 3,200 to 5,000 feet, 

 June. Southwestern Colorado to northern Arizona and southeastern 

 California. 



Arizona's most shrubby species, with stems up to 1 m. (3 feet) high, 

 intricately branched, tending to form hummocks. The typical form, 

 represented by Jones' collection, has herbage with spreading hairs and 



