48 RYDBERG: Rocky MOUNTAIN FLORA 
Phaca jejuna (S. Wats.) Rydb. 
Astragalus jejunus S. Wats. Bot. King Exped. 73. 1871. 
Phaca leptalea (A. Gray) Rydb. 
Phaca pauciflora Nutt.; T. & G. Fl. N. Am. 1: 348, 1838. Not 
P. pauciflora Pers. 1806. 
Astragalus leptaleus A. Gray, Proc. Am. Acad. 6: 220. 1864. 
: Phaca artemisiarum (M. E. Jones) Rydb. 
Astragalus Beckwithii 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. 1: 335. 1838. 
Not A. multicaulis Ledeb. 1831. 
Astragalus pubentissimus T. & G. Fl. N. Am. 1: 693. 1840. 
Mr. Sheldon placed this between Astragalus crescenticarpus 
and A. cibarius, two species of Xylophacos; its pod is that of a 
Phaca. 
Phaca sesquiflora (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. t: 147. 1894. 
Xylophacos cibarius (Sheld.) Rydb. 
Astragalus cibarius Sheld. Minn. Bot. Stud. 1: 149. 1894. 
Astragalus arietinus M. E. Jones, Proc. Calif. Acad. II. §: 653. 
1895. 
Xylophacos puniceus (Osterh.) Rydb. 
Astragalus puniceus Osterh. Muhlenbergia 1: 140. 1906. . 
Xylophacos Zionis (M. E. Jones) Rydb. 
Astragalus Zionis M. E. Jones, Proc. Calif. Acad. IT. 5: 652. 1895. 
