46 LEGUMINOS^E. 



11. ASTRAGALUS, Tournefort. 



* Annuals: pods 2 -celled. 



Pods 1 or 2 lines long, 2-seeded, wrinkled: spikes short 1, 2 



Pod linear, straight, 5 to many seeds: flowers capitate 3, 4 



Pods 3 to 5 lines long: spikes of small white flowers very long 5 



Pods ovoid, long-beaked, gray-silky : flowers capitate, white 6 



* * Perennials: pods 1-celled, with thin walls, inflated, bladder-like. 



Pods on stipes equaling or little exceeding the calyx 7, 8, 9 



Pods on filiform, stipes much exceeding the calyx: stem erect 10, 11, 12 



Pods sessile in the calyx, 1-2 inches long: many seeds 13 to 17 



5 to 8 lines long: stems low: flowers 3 lines long 18, 19 



* * * Perennials: pods turgid, not bladder-like, coriaceous, densely long-woolly or downy, 



incurved 20, 21, 22 



* * * * Perennials: pods often turgid, not bladder-like, not long-hairy or woolly. 



Pods stipitate, 1-celled, sutures not inflexed 23 to 26 



2-celled: cross section obcordately 2-lobed 27 



Pods not stipitate, 1 or 2 inches long, 1-celled 28, 29 



2 or 3 lines long, 2-celled 30 



2 lines long, hoary, cylindric-oval 31 



3 lines long, 1-celled: leaflets spiny-tipped 32 



1. A. didymoearpus, H. & A. Calyx equaling the erect pod, black -hairy. 



2. A. nigrescens, Nutt. Calyx as long as the pendulous lightly wrinkled pods. 



3. A. tener, Gr. Violet and white flowers: pods 5-7 lines long, drooping. 



4. A. Rattan!, Gr. Flowers larger, violet: pods slender, 1-1 inches long, erect. 



5. A. Cleveland!!, Greene. Tall: leaflets -f in. long, mucronate. 



6. A. Brewer!, Gr. Similar in habit to No. 4: pods 3-4 lines long, beaks longer. 



7. A. Hookerianus, Dietr. Diffuse, silky, a span high: pod obovoid, obtuse. 



8. A. oxyphysus, Gr. Erect, 2 or 3 ft. high, silky: pod slender-obovoid, acuminate. 



9. A. curtipes, Gr. Lower, not silky: stipules united: pod ovoid or oval, acute. 



10. A. leucophyllus, T. & G. Oval pod one-sided, filiform hairy stipe very long. 



11. A. leucopsis, T. & G. Similar pod tapering into a smooth stipe half as long. 



12. A. trichopodus, Gr. Pods smaller, 6 lines long or more, stipe 3 lines long. 



13. A. oocarpus, Gr. Straggling stems 3-6 ft. long: green stipules mostly deflexed. 



14. A. Crotalarise, Gr. Scarious stipules distinct: ovoid pod 1-1 inches long. 



15. A. Menziesii, Gr. Similar: upper stipules united: pod larger, more bladdery. 



16. A. macrodon, Gr. Like the preceding: flowers smaller: peduncles short. 



17. A. Douglas!!, Gr. Spike an inch long or less: pod ovoid 1^-2 inches long. 



. 18. A. Horn!!, Gr. Pods in a dense head or short spike, ovoid, acuminate, hairy. 

 19. A. Pulsiferse, Gr. White hairy: pods few ovoid, curved, 3-S-seeded. hairy. 

 20 A. Purshii, Dougl. Tufted, silky: peduncles 5-6-flowered: pod ovoiu. 



