186 PAPILIONACEAE 



16. AESCHYNOMENE L. 



1. Aeschynomene Virginica (L.) B.S.P. Sensitive Joint Vetch. 

 (Man. p. 558 ; I. F. /. 2167. ) River banks, southeastern Pa. and N. J. to 

 Fla., west to La. — Pennsylania : Delaware. 



17. STYLOSANTHES Sw. 



1. Stylosanthes biflora (L.) B.S.P. Pencil-flower. (Man. p. 

 558 ; I. F. f. 2/6S.) In dry soil, southeastern N. Y. to Fla., west to lud., 

 Kans., the I. Terr, and La. — Pettnsylvania : Monroe : Northampton ; 

 Bucks; Delaware ; Chester ; Berks ; Lebanon ; Lancaster ; Mont- 

 gomery ;-YoRK ; Frankijn ; Fayette. 



18. MEIBOMIA Adans. 

 Pods straight along the upper suture, deeply constricted along the lower suture. 

 Scape and leaf arising from the rootstock. i. M. nudiflora. 



Scape arising from a whorl of leaves or terminating a leafy stem. 



Leaves whorled. 2. M. grajidiflora. 



Leaves scattered. 3. M. pmiciflo7-a. 



Pods constricted along hoth sutures, but more deeply below than above. 

 Stems weak, trailing or reclining. 



Leaflets with orbicular or suborbicular blades. 4. M. Michauxii. 



Leaflets with ovate or oval blades. 

 Corolla whitish : leaves yellowish green : stipules ovate. 



5. M. ochrolenca. 

 Corolla purple: leaves dull green: stipules subulate. 6. M. glabella. 

 Stems erect or ascending. 



Leaves with little or no petioles. 7. M. sessilifolia. 



Leaves with relatively long petioles. 

 Joints of the pod markedly longer than wide. 



Leaflets with obtuse yellowish green rough-pubescent blades. 



8. M. canescetis. 

 Leaflets with long-acuminate glabrous blades, glaucous beneath. 



Q. M. bract eosa. 

 Joints of the pod only slightly longer than wide. 

 Pods manifestly stipitate. 

 Plants glabrous or nearly so. 

 Leaflets green beneath, the blades lanceolate to oblong. 



10. M. paniculata. 

 Leaflets glaucous beneath, the blades ovate to oval. 



11. M. laevigata. 

 Plants pubescent or scabrous-pubescent. 



Leaflets velvety-pubescent beneath, the blades leathery. 



12. M. viridiflora. 

 Leaflets thinly pubescent beneath, the blades thin. 



13. M. Dillenii. 

 Pods not stipitate or scarcely so. 



Pods 4-7- jointed : corollas conspicuous. 14. M. Canadensis. 



Pods 2-3-jointed : corollas relatively inconspicuous. 

 Leaflets scabrous, the blades mostly over 2 cm. long. 



15. M. rigida. 

 Leaflets smooth, the blades mostly less than 2 cm. long. 

 Stem glabrous or nearly so: leaflets eciliate. 16. M. Marylatidica. 

 Stem pubescent : leaflets ciliate. 17. M. obtusa. 



