Rydberg: Notes ox Fabaceae — II 269 



Leaflets few, the terminal one wanting or continu- 

 ous with the rachis; calyx-lobes lanceolate, 1.5-2 

 mm. long. 38. H. Coltoni. 



Leaflets many, the terminal one present ; calyx lobes 

 triangular, 1 mm. long or less. 



Leaflets slightly strigose beneath or glabrous 



throughout. 39- H. stenophyllus. 



Leaflets strigose-cinereous on both sides. 

 Stipe of the pod fully half as long as the 



body, ocrolla ochroleucous or white. 40. II. MacGregorii. 



Stipe about one third as long as the body; 

 corolla purple. 41. H. canovirens. 



Leaflets linear-oblong to oval, glabrous above, 



strigose beneath. 42. II. Antiselli. 



Pod strigose throughout. 



Leaflets linear; raceme elongate lax. 



Body of the pod 2-2.5011. long abruptly contracted 



at the base, straight. 43. H.filtpes. 



Body of the pod 2.5-3 cm - long, gradual!)' tapering 



at each end, slightly arcuate. 44- TI. inversus. 



Leaflets elliptic; raceme short dense. 45. .1. gavwtus. 



38. Homalobus Coltoni (M. E. Jones) Rydb. comb. nov. 

 Astragalus Coltoni M. E. Jones, Zoe 2: 237. 1891. 

 Homalobus episcopus Rydb. Bull. Torrey Club 40: 53, in part. 



191 3. Not A. episcopus S. Wats., 1875. 



Astragalus Coltoni was based on specimens from Castle 

 Gate, Utah. It has the habit of //. junceus and H . campestris, 

 but the pod has a slender stipe, the corolla is purplish, the 

 wings are nearly as long as the banner and the keel is rounded 

 at the apex. It is therefore more closely related to H. steno- 

 phyllus. I had mistaken it for //. episcopus (see my notes 

 under that species on pages 184-5). 



Utah: Castle Gate, Jones, in 1890 and 1894; southern Utah, 

 Bishop, in 1872. 



New Mexico: Carrigo Mountains, Matthews, in 1892. 



39. Homalobus stenophyllus (T. & G.) Rydb. This is the 

 best known species of the group and was the first one published, 

 the original name being Astragalus leptophyllus Nutt. As that 

 name was preoccupied, A. stenophyllus was afterwards substi- 

 tuted. Torrey & Gray suggested thai the species might belong 

 in the genus Homalobus. The type was collected in flower, 

 and the fruit remained unknown for some time. The type is 



