RvDBERG : Astragalus and its segregates 659 



genus Is represented In Colorado by: A. mollissimus Torr., A. 

 Bigelowii A. Gray, A, anisiis Jones, A. canadensis L., A, cobra- 

 densis Rydb., A. nitidus Dougl. {A, adsurgens Hook.; not Pall.), 

 A, sulphnrcscens Rydb., A. virgidtatus Sheld. and A. goniatns Nutt. 



3. HAMOSA Medic. Vorles. Churpf. Phys. Ges. 



2: 1^6. 1787. 



The type of this genus was Astragalus haviosus L, To it 

 belongs, beside H. Nuttalliana (DC.) Rydb. and H, Icptocarpa 

 (T. & G.) Rydb. already named, also the following : 



Hamosa scaposa (A, Gray) Rydb. 



Astraghcs scaposits A. Gray Proc. Am. Acad. 13: 166, 1878. 



. 4- CYSTIUM Stev. Bull. Soc. Nat. Mosc. 4 : 268. 1832. 



This genus was based on Astragalus Cicer L., A, Pallash 

 Sprengel and A, physodes L. Congeneric with these are : 



Cystium diphysum (A. Gray) Rydb. 



Astragalus diphysus A. Gray, PI. Fendl. 34. 1849. 



Cystium ineptum (A. Gray) Rydb. 



Astragalus inceptus K. Gray, Proc. Am. Acad. 6: 525. 1865. 



5. TIUM Medic. Vorles. Churpf Phys. Ges. 2: 373. 1787. 



• This was based on Astragalus stdcatus L. The typical Color- 

 ado species of this genus are : 



Tium Drummondii (Dougl.) Rydb. 



Astragalus Driunmondii Dougl.; Hook. Fl. Bor. Am. i : 153. 

 1831. 



Tium racemosum (Pursh) Rydb. 



Astragalus racemosus Pursh, Fl. Am. Sept. 740. 18 14. 



Tium scopulorum (Porter) Rydb. 



Astragalus scopulorum Porter, In Porter & Coult. Syn. Fl. Colo. 



24. 1874. 



I refer to It also the following, which although not closely 

 related to the type fit better in this genus than in any other : 



Tium alpinum (L.) Rydb. 



Astragalus alpinus L. Sp. PI. ^^o. 1753- 



