48 Rydberg : Rockv Mountain flora 



Phaca jejuna (S. Wats.) Rydb. 

 Astragalus jejun us S. Wats. Bot. King Exped. 73. 1871. 



Phaca leptalea (A. Gray) Rydb. 

 Phaca pauciflora Nutt.; T. & G. Fl. N. Am. i: 348, 1838. Not 



P. pauciflora Pers. 1806. 

 Astragalus leptaleus A. Gray, Proc. Am. Acad. 6: 220. 1864. 



Phaca artemisiarum (M. E. Jones) Rydb. 



Astragalus Beckuithii purpureus M. E. Jones, Zoe 3: 288. 1893. 



Not A. purpureus Lam. 1783. 

 Astragalus artemisiarum M. E. Jones, Zoe 4: 369. 1894. 



Phaca pubentissima (T. & G.) Rydb. 

 Astragalus multicaulis Nutt.; T. & G. Fl. N. Am. i: 335. 1838. 



Not A. miulticaiilis Ledeb. 1831. 

 Astragalus puhenlissimus T. & G. Fl. N. Am. i: 693. 1840. 



Mr. Sheldon placed this between Astragalus crescenticarpus 

 and A. cibarius, two species of Xylopliacos; its pod is that of a 

 Phaca. 



Phaca sesquifiora (S. Wats.) Rydb. 

 Astragalus sesquiflorus S. Wats. Proc. Am. Acad. 10: 346. 1875. 

 Mr. Sheldon associated this erroneously with Astragalus 

 vexilliflexus and other species of Homalobus. It is a true Phaca. 



Xylophacos cuspidocarpus (Sheld.) Rydb. 

 Astragalus cuspidocarpus Sheld. Minn. Bot. Stud, i: 147. 1894. 



Xylophacos cibarius (Sheld.) Rydb. 

 Astragalus cibarius Sheld. Minn. Bot. Stud, i: 149. 1894. 

 Astragalus arietinus M. E. Jones, Proc. Calif. Acad. II. 5: 653. 

 1895. 



Xylophacos puniceus (Osterh.) Rydb. 

 Astragalus puniceus Osterh. Muhlenbergia i: 140. 1906. 



Xylophacos Zionis (M. E. Jones) Rydb. 

 Astragalus Zio7iisM.'E. ]ones,Vroc. CdiWi. Acsid. II. 5: 652. 1895. 



