FLOWERING PLANTS AND FERNS OF ARIZONA 479 



14. Astragalus remulcus M. E. Jones, Calif. Acad. Sci. Proc. ser. 2, 



5: 658. 1895. 



Xylophacos remulcus Rydb., Torrey Bot. Club Bui. 52: 153. 

 1925. 



Coconino, Gila, and Yavapai Counties, 4,500 to 5,000 feet, often 

 among chaparral, April to June, type from Bangharts (Del Rio), 

 Yavapai County (Rusby 576). New Mexico and central Arizona. 



15. Astragalus chloridae (M. E. Jones) Tidestrom, Biol. Soc. Wash. 



Proc. 48: 43. 1935. 



Astragalus remulcus var. chloridae M. E. Jones, Rev. North 



Amer. Astrag. 210. 1923. 

 Xylophacos chloridae Rydb., Torrey Bot. Club Bui. 52: 153. 



1925. 



Gila, Maricopa, and Mohave Counties, 3,500 to 4,500 feet, April, 

 type from Chloride, Mohave County (Jones in 1903). Known only 

 from Arizona. 



This and the 2 preceding are connected by numerous specimens of 

 intermediate character and should perhaps be regarded as constitut- 

 ing a single variable species. 



16. Astragalus curtilobus Tidestrom, Biol. Soc. Wash. Proc. 48: 40. 



1935. 



Astragalus shortianus Nutt. var. brachylobus A. Gray, Amer. 



Acad. Arts and Sci. Proc. 13: 367. 1878. 

 Xylophacos brachylobus Rydb., Torrey Bot. Club Bui. 52: 



154. 1925. 



Apache County to eastern Mohave and Gila Counties, 5,000 to 

 8,000 feet, rocky or sandy places, May to July, type from Arizona. 

 Southern Colorado to southern Nevada, New Mexico, and Arizona. 



17. Astragalus castaneaeformis S. Wats., Amer. Acad. Arts and Sci. 



Proc. 20: 361. 1885. 



Xylophacos castaneaeformis Rvdb., Torrev Bot. Club Bui. 52: 



155. 1925. 



Coconino and northern Gila Counties, 5,800 to 7,000 feet, among 

 pines, often in rocky places, May, type from Williams (Lemmon in 

 1884). Known only from Arizona. 



Distinguished from most of these nearly related, acaulescent species 

 by its short, broad pods. 



*18. Astragalus vespertinus Sheldon, Minn. Geol. and Nat. Hist. 

 Survey Bot. Studies 1: 150. 1894. 



Xylophacos vespertinus Rydb., Torrey Bot. Club Bui. 32: 

 662. 1906. 



Not known definitely from Arizona but has been collected in the 

 Carrizo Mountains, New Mexico {Matthews in 1892), and this range 

 of mountains extends into the northeastern corner of Arizona. 



280744° — 42 .*U 



