46 LEGUMINOS&. 
11. ASTRAGALUS, Tournefort. 
“ Annuals: pods 2-celled. 
Pods 1 or 2 lines long, 2-seeded, wrinkled: spikes short..............-- apocoiasncoreitisis LG, tee 
Pod linear, straight, 5 to many seeds: flowers capitate...........0-.e eee essere eee 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............-..+eees eee 6 
** Perennials: pods 1-celled, with thin walls, inflated, bladder-like. 
Pods on stipes equaling or little exceeding the calyx..............2.0+ eee eeee 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.............--- +20 000 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, 
WNCUTVED 2 cca wta ween aio vod gaiton OAR EL eR BERS DE eee Bee eeas weleats 20, 21, 22 
*“*** Perennials: poda often turgid, not bladder-like, not long-hairy or woolly. 
Pods stipitate, 1-celled, sutures not inflexed........... 00.20 c cece cece eens 23 to 26 
2-celled: cross section obcordately 2-lobed...........-22-....000000% 27 
Pods not stipitate, 1 or 2 inches long, 1-celled............ cee cee eee eee e cece 28, 29 
2 or 3 lines long, 2-celled...... 0.2... cece eee cee eee e eee e eens 30 
2 lines long, hoary, cylindric-oval............0..ecceeeeeeee eee 31 
3 lines long, 1-celled: leaflets spiny-tipped..................... 32 
1. A. didymocarpus, H. & A. Calyx equaling the erect pod, black-hairy. 
2. A. nigrescens, Nutt. Calyx 4 as long as the pendulous lightly wrinkled pods. 
3. A. tener, Gr. Violet and white flowers: pods 5-7 lines long, drooping. 
4, A. Rattani, Gr. Flowers larger, violet: pods slender, 1-14 inches long, erect. 
5. A. Clevelandii, Greene. Tall: leaflets 4-2in. long, mucronate, 
6. A. Breweri, 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 defiexed. 
14. A. Crotalarigs, Gr. Scarious stipules distinct: ovoid pod 1-14 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. Douglasii, Gr. Spike an inch long or less: pod ovoid 14-2 inches long. 
18. A. Hornii, Gr. Pods in a dense head or short spike, ovoid, acuminate, hairy. 
19. A. Pulsifers, Gr. White hairy: pods few ovoid, curved, 3-8-seeded hairy. 
20 A. Purshii, Dougl. Tufted, silky: peduncles 5-6-flowered: pod ovoia. 
