CONTRIBUTIONS TO WESTERN BOTANY. 649 



Astragalus Calif ornicus (Gray) Greene seems to me 

 to be a good species, the distinguishing characters being 

 the more numerous leaflets, the long, tapering, mottled 

 pods, and the shorter calyx. More abundant material 

 might, however, prove these characters to be invalid, but 

 so far they are good. 



Astragalus Tweedyi Canby seems to be very distinct, 

 but close to A. collinus. Calyx ascending; pods i-celled, 

 erect, on a stout stipe, which is yi longer than the calyx, 

 with the shape of A. arrectus, nearly cylindrical, shortly 

 acute at both ends, nearly straight, 6 to 8" long, lyi" wide, 

 about i" thick; cartilaginous, and like all the rest of its 

 group, filled with pulp; leaflets fully linear, blunt, 6-8 

 pairs, i" wide, i' long, rather distant, almost no proper 

 petiole; stipules very small; plants erect, 2° high; pe- 

 duncles strict, 6-12' long, sulcate; whole plant finely pu- 

 bescent, with slender hairs fixed by the base. 



These notes taken from a duplicate type. 



ASTRAGALIS HUMISTRATUS var. TENERRIMUS. 



No. 6o52f. September 17, 1894, Buckskin Mountains, 

 Arizona, 9000° alt., in gravel, under conifers. 



No. 6064. September 20, 1894, road to Nagle's Ranch, 

 Buckskin Mountains, Arizona, 9000° alt., in gravel. 



No. 6o56bm. Same locality and date. 



This variety is characterized by having very many slen- 

 der stems lying perfectly flat, on the ground and covered 

 with soil towards the base, the whole forming a mat from 

 1^—3° in diameter; the leaflets are mostly in 4-6 pairs, 

 ovate to obovate and rounded, i/^" or less long arid nearly 

 glabrous; the flowers are very few, in a loose, short 

 raceme, nearly white, with filiform calyx lobes longer 

 than the tube, and the pods of A. Sonorce Gray (which 

 is only a form of humistratits). 



2d See., Vol. V. { 42 ) October 3, 1895, 



