658 Rydberg : Astragalus and its segregates 



Lower suture not intruded or merely slightly so ; pods in the latter case woody. 

 Pods strongly inflated, papery. • 14- Phaca, 



Pods not inflated, or slightly so, membranous to woody. 



Pods with a partial partition, formed by the inflexion of the lower suture. 

 Pods membranous. 6. Atelophragma. 



Pods woody. 



Pods stipitate; leaves unifoliolate. 7. Jonesifxla. 



Pods sessile ; leaves pinnate. 



Calyx-tube short, campanulate, equaling or shorter than the lobes ; 



tall glabrous plants. 8. Phacopsis. 



Calyx-tube cylindrical, longer than the lobes ; low, cespitose, cinerous 

 or villous plants. 9- Xyi-OPHACOS. 



Pods without a vestige of a partition. 



Pods not with two grooves on the upper side (or, if slightly grooved, sessile). 

 Pods with a fleshy epicarp, in fruit cross-ribbed ; leaflets obscurely 

 articulated to the rachis, fleshy, narrow, lo. Ctenophyllum. 



Pods without fleshy epicarp; leaflets distinctly articulated to the rachis. 

 Pods woody or at least leathery, flattened or slightly intruded on the 

 lower side. 

 Calyx cylindrical ; flowers large ; plant mostly low and cespitose. 



9. Xyi.ophacos. 



Calyx campanulate ; flowers small. 



Corolla yellow ; calyx-lobes linear-lanceolate, equaling the tube ; 

 stipules united ; stem low, 12. Cnemidophacos. 



Corolla purple; calyx-lobes triangular, much shorter than the 

 tube; stipules free or nearly so ; stem tall and slender. ■ 



II, MiCROFHACOS. 



Pods membranous, usually more or less flattened laterally, with both 

 sutures prominent. 

 Leaves spinulose-tipped ; pods 1-2-seeded. 15, Kentrophyta. 

 Leaves not spinulose-tipped ; pods several- to many-seeded. 



16. HOMALOEUS. 



Pods with two grooves on the upper side, stipitate, 13. DiHOl.cos. 



Leaves digitately trifoliate. 



17. Orophaca. 



GEOPRUMNON 



903 



Besides by the type, G, crassicarpum (Nutt.) Rydb., the genus 

 is represented by : 



Geoprumnon succulentum (Richardson) Rydb. 



Astragalus succidentns Richardson, Franklin Journey 746. 1823. 

 Astragalus puniferV.y6h. Mem. N. Y. Bot. Gard. 1 : 239. 1900. 



2. ASTRAGALUS L. Sp. PL 755. 1753. 



As the type, I regard A. christianus L., which was an article of 

 food in the desert regions of Syria and the Holy Land. The 



