648 CALIFORNIA ACADEMY OF SCIENCES. 



A. s-patulatus Sheldon, 1. c. 9, 19; A. lingulatus Sheldon, 

 1. c. 9, 118. The last seems to be identical with Homa- 

 lobits canescens Nutt. This species is quite variable. 



Astragalus hyalinus. Nearest to A . t7-ifhyllus Pursh. 



Stems loosely matted, usually erect, i to 2' high, at the 

 ends of the much branched thick root; stipules very con- 

 spicuous, large, much imbricated, at least 9" long, smooth 

 except at the very base, where there is a tuft of long, 

 straight, white hairs; leaflets narrowly elliptical to ob- 

 lanceolate, about 6" long and 2" wide, obtuse or barely 

 acute, 3, densely silky all over, with hairs attached by the 

 middle, on a varying petiole; flowers, one or two in a 

 place, sessile at the base of the leaf, apparently white 

 with a dark keel tip; calyx very white-villous, cylindrical, 

 6" long, ij^" wide, little exceeding the stipules, teeth 

 subulate, i" long; corolla very pubescent outside, banner 

 oblanceolate, emarginate, about i' long and i^ " wide, 

 proper blade 3" long; wings narrowly linear and as long 

 as the banner; keel 3" shorter than the wings, very nar- 

 row, apex but little arched; fruit immature but manifestly 

 sessile, very white-silky, ovate or triangular, round in 

 cross-section, 3" long. At first I took this to be an ab- 

 normal form of A. triphyllus, due to a fungus, but care- 

 ful examination failed to show any fungus growth, while 

 some specimens showed normal vigorous pods. This 

 differs from A. t7'i^hylh{s in the pubescent corolla, 

 broader leaflets, stems, and the very conspicuous stipules. 

 A. triphyHus is densely congested, like Krynitzkia are- 

 tioides. Upper Lawrence Fork, Kimball County, Ne- 

 braska, No. 80; Cliffs, Banner County, Nebraska, 

 August, 1890 ; Hills, Kiowa valley, Scott's Bluff Count}^ 

 Nebraska; all collected by Rydberg. Type in Univer- 

 sity of Nebraska and duplicate types in National Herba- 

 rium. 



