Sheldon: SPECIES OF astragalus. 155 



Astragalus ibapensis Jones. Zoe. 3:290. 1893. 

 Utah. 



Astragalus robbinsii (Oakes) A. Gray. Man. Bot. ed. 

 II. 98. 1856. 



Phuca robbinsii Oakes in A. Graj'. Man. Bot. ed. r. 103. 1848. 

 A. robbinsii (Oakes) A. Gray. var. occidentalis Wats. Bot. 



King. Kep. 6:70. 1871. 

 Tragacantha robbinsii OK. Rev. Gen. PL 2:946. 1891. 



Perennial, many- stemmed from a fibrous, knotty root, 

 minutely, sparsely pubescent, becoming glabrate; stem 2 to 5 

 dm., high, erect, simple, nearly terete, twisted striate; leaves 

 4 to 5 cm. in length; leojlets 9 to 13 mm. in length, in four to 

 six pairs, oblong- oval, obtuse or rarely slightly retuse, glab- 

 rous above, nearly pubescent beneath with white, appressed 

 hairs when young, becoming nearly glabrous: stipules erect, 

 connate below, but ovate-acuminate above; peduncles 9 to 20 cm. 

 in length, slender, terete or very finely striate, bearing a sub- 

 spicate raceme; flowers^ mm. in length, short-pedicellate; calyx 

 campanulate, slightly puberulent, but not nigrescent except 

 the linear teeth which are one-fifth the length of the tube; 

 corolla white; leyinne 14 to 18 mm. in length, oblong, dorsally 

 straight, ventrally arcuate, born on a stipe equalling the calyx, 

 minutely pubescent with appressed, nigrescent hairs, broadly 

 reticulate-veined, becoming diaphanous, unilocular, the dorsal 

 suture projecting into the cavity as a thin membrane, 4 to 6 

 seeded. 



Vermont and Colorado. 



Astragalus robbiasii (Oakes) A. Gray. var. jesupi 

 Eggleston and Sheldon. 



Perennial, many stemmed from a fibrous, knotty root, nearly 

 glabrate; stem B to 6 dm., high, less spreading than typical 

 specimens of the species; leaves 4 to 8 cm. in length; leaflets 8- 

 22 mm. in length, in five to eight pairs, oblong, oval or lance- 

 olate, obtuse or slightly retuse, glabrous above, puberulent 

 below with midrib and sometimes margin slightly hairy; stip- 

 ules deflexed; peduncles 8 to 25 cm. in length, bearing a subcap- 

 itate raceme; floiuers 10 mm. in length; corolla dark purple; 

 legume 18 to 25 mm. in length, oblong, elongated, slightly 

 transparent, strongly nigrescent when young, becoming nearly 

 glabrate, six to ten seeded. 



