RvDBERG : Astragalus and its segregates GG3 



10. Ctenophyllum Rydb. gen. nov. 



Stout perennials with often several stems rising from the same 

 root and more or less stoloniferous. Leaves pinnate, with 1 1-19 

 linear to filiform leaflets, which are very indistinctly jointed to the 

 rachis ; stipules ovate, free from the petioles, but (especially the 

 lower) united back of the stem. Peduncles usually equaling the 

 leaves ; raceme short. Calyx cylindro-campanulate, very gibbous 

 at the base on the upper side. Corolla ochroleucous, with narrow 

 petals ; keel almost straight. Pod oblong, terete, coriaceous with 

 a subfleshy epicarp, in age cross-wrinkled, with thick and promi- 

 nent sutures, neither of which is inflexed. 



Ctenophyllum pectinatum (Hook.) Rydb. 



Phaca pcctinata Hook. Fl. Bor. Am. 1 : 141. 1 831. 

 Astragalus pcctinatns Dough; Hook. loc. cit. 142, as a synonym. 



11. Microphacos Rydb. gen. nov. 



Subcinereous perennials with very slender stems. Leaves 

 pinnate with i r-17 linear to oblong leaflets ; stipules v^ery broad, 

 triangular, free from the petioles and only the lower more or less 

 united with each other. Racemes many-flowered. Calyx short- 

 campanulate, about 2 mm- long, with very short and broad teeth. 

 Corolla purple, 5-6 mm. long, all petals strongly curved. Pod 

 6—8 mm. long, coriaceous, cross-wrinkled, wholly i-celled, 6-7- 

 ovuled, boat-shaped, i, ^., lower suture prominent, strongly curved, 

 upper suture nearly straight or curved upwards, flat or slightly 

 sulcate. 



The first species is to be regarded as the type. 



Microphacos gracilis (Nutt.) Rydb. 



" L ■- 



^Astra^alus gracilis J^xxtt. Gen. 2: 100. 18 18. 



Microphacos microlobus (A. Gray) Rydb. 



Astragalus microlobus A. Gray, Proc.Am. Acad. 6 : 203. 1863. 



12. Cnemidophacos Rydb. gen. nov. 



Cespitose perennials with a woody caudex ; stems short, i 2 

 dm. high. Leaves pinnate with many narrow leaflets, cinereous ; 

 stipules slightly united with the petioles, but almost wholly united 

 behind the stem forming a sheath. Racemes strict and many- 

 flowered. Calyx deeply campanulate; lobes linear-lanceolate, 

 equaling the tube. Corolla yellow, with narrow petals. Pod 

 coriaceous, oblong-ovoid, rounded below, somewhat depressed 

 above, but with a very sharp suture and hence somewhat 2- 

 grooved. 



