PAPILIONACEAE. 



[Vol.. II. 



i. Sesban macrocarpa Muhl. Long- 

 podded Sesban. (Fig. 2124. ) 



Sesbania macrocarpa Muhl.; Ell. Bot. S. C. & Ga. 2: 

 221. 1821. 



Annual, glabrous, widely branching, 4-i2 tall. 

 Leaflets 10-35 pairs, oblong, obtuse, mucronate, 

 thin, i' long or less, 2 // ~3 / ' wide, pale beneath; 

 racemes shorter than the leaves, i-5-flowered; 

 calyx-teeth subulate, shorter than the tube; corolla 

 yellowish, purple-spotted, the standard 8"-io" 

 long; pod 6 / -i2 / long, about -2" wide, somewhat 

 curved, drooping, tipped with the subulate style. 



In wet or moist soil, Missouri to Texas, east to South 

 Carolina and Florida, south to Central America. Col- 

 lected also in southern Pennsylvania. June-Sept. 





23. ASTRAGALUS L. Sp. PI. 755. 1753. 



Herbs, sometimes woody, mostly with odd-pinnate or sometimes simple leaves, and pur- 

 ple violet white or yellow flowers in spikes or racemes, or rarely umbellate or solitary. Stip- 

 ules present. Calyx tubular, its teeth nearly equal. Petals clawed; standard erect, ovate or 

 oblong; wings oblong; keel obtuse, about equalling the wings. Stamens diadelphous; an- 

 thers all alike. Ovary sessile or stipitate; ovules oo . Pod sessile or stalked, dehiscent or in- 

 dehiscent, i-2-celled, very different in different species and affording the best characters in 

 classification. Greek name of some leguminous plant.] 



About 1000 species, of wide geographic distribution, most abundant in northern Asia. In addi- 

 tion to the following, at least 175 others occur in the western and southern United States. 



X- Pod a-celled. 



Pod fleshy, thick-walled, indehiscent. 

 Pod glabrous, globose, or oval. 

 Corolla purple; pod pointed. 

 Corolla yellowish-white; pod obtuse. 

 Pod pubescent, ovoid or oblong. 



Pod ovoid, about 6" long, not wrinkled. 

 Pod oblong, curved, i' long or more, wrinkled. 

 Pod dry, leathery, cartilaginous or papery, dehiscent. 

 Plant densely villous-pubescent all over. 

 Plants glabrous, or grayish-pubescent 



Flowers yellowish; pod terete, glabrous. 

 Flowers purple; pod with a deep furrow, pubescent. 

 Pod finely appressed-pubescent. 



Pod densely villous with white hairs. 8. A. Hypoglottis. 



X- -X- Pod i-celled, but one or both sutures sometimes intruded. 



t Pod swollen. 



Pod triangular or heart-shaped in section, membranous; flowers mostly yellowish -white. 

 Pod heart-shaped in section; plant woolly-pubescent. 9. A. 



Pod triangular in section; plant appressed-pubescent. 10. A. 



Pod 2-grooved on the upper side; flowers purple. n. A. 



Pod nearly circular, or 8-shaped, in sectipn, mostly coriaceous. 



Leaflets narrowly linear, elongated, persistent; flowers yellow. 12. A. peclinatus. 



Leaflets oblong, lanceolate, oblanceolate, oval or linear, deciduous. 

 Plants scapose, or short-stemmed, villous or silvery-pubescent. 



Plant gray-villous; flowers yellow. 13. A. lotiflorus. 



Plants silvery-pubescent; flowers blue, violet or purple. 



Pod nearly circular in section, straight. 14. A. Missouriensis. 



Pod 8-shaped in section, its summit curved. 15. A. Shorlianus. 



Plants leafy-stemmed, appressed-pubescent or glabrate; flowers purple. 

 Pod 3-6" long, wrinkled; flowers 3" long or less. 



Plant erect; leaflets obtuse, very narrow. 16. A. gracilis. 



Plant diffuse; leaflets emarginate, short-linear. 17. A. microlobus. 



Pod more than 6" long, smooth; flowers 6" long or more. 



Pod not grooved, puberulent. 18. A. flexuosus. 



Pod grooved on the lower side, glabrous. 19. A. distortus. 



t t Pod flattened, membranous. 



Pod sessile in the calyx, black-pubescent; flowers purple. 20. A. elegans. 



Pod stalked, glabrous; flowers white to violet. 21. A. aboriginorum. 



pubescent, slightly grooved, 9" long; flowers white or purple. 22. A. Robbinsii. 

 pubescent, deeply grooved on lower side, 6" long; flowers violet. 23. A. alpinns. 



1. A. crassicarpus. 



2. A. Mexicanus. 



3. A. Plaltensis. 



4. A. Tennesseensis. 



5. A. mollissimus. 

 6 A. Carolinianus. 

 7. A. adsurgens. 



Drummondii. 



racemosus. 



bisulcatus. 



