Rydberg: Notes on Fabaceae — I 183 



to that of //. strigulosus, made H. dementis a variety of Astrag- 

 alus tenellus. He had evidently not seen the type or a duplicate 

 of the type of H. dementis, but had seen specimens of Baker 

 489 from Marshall Pass, Colorado, which evidently belong to 

 H. dementis. In our specimen of this number the pods are 

 very immature, but a closer examination would have shown 

 Macbride that Baker's plant and Standley 4181 were not the 

 same. In the type of H. dementis the pods are half broader 

 than in H. Standleyi, distinctly black-hairy and tapering at 

 both ends, but the stipe if any is only a fraction of a millimeter 

 long, i. e. the pod is subsessile; the corolla also is much larger. 

 Baker 489 also has black-hairy pods. 



12. Homalobus acerbus (Sheld.) Rydb. Macbride re- 

 duced this species to Astragalus tenellus forma acerbus, but had 

 evidently seen no specimens of it. M. E. Jones has referred 

 the type of A. acerbus in the Columbia Herbarium to A. ivinga- 

 tanus and expressed his views in print.* as follows: "Astragalus 

 acerbus seems to be identical with A. Dodgeanus Jones, and the 

 latter is not surely separable from A. wingatensis \wingatanus\." 

 In H. tenellus and its closer relatives the corolla is ochroleucous 

 (not a very important character); the racemes, together with 

 the peduncles, seldom overtop the leaves to any extent; the 

 pods are decidedly veiny; and the plants are inclined to blacken 

 in drying. In H. acerbus, on the other hand, the corolla is 

 white or purple-tinged; the racemes are twice to four times as 

 long as the leaves; the venation of the pods is indistinct; and 

 the plants show no inclination to blacken. The following 

 specimens belong here: — 



Colorado: Glenwood Springs, 1893, Saunders; DeBeque, 

 Osterhout 4282; Grand Junction, 1895, M. E. Jones. 



13. Homalobus Dodgeanus (M. E. Jones) Rydb. At 

 present I have no authentic specimens of this species before me 

 but, according to my memory, it is very closely related to H. 

 acerbus, and Jones, as shown above, regards the two as identical. 

 In fact Jones's own specimens, determined by him as Astragalus 

 Dodgeanus, from Grand Junction, collected May 22, 1895, 

 represent H. acerbus and are here listed under that species. 



* Proc. Calif. Acad. II. 5: 636. 1895. 



