FABACEAE: Legume Family
KEY TO SPECIES OF SESBANIA
1. Corolla 9-12 mm; fruits 6-8 mm across, not winged but with longitudinal ridges with a deep narrow trough between; outerside of fully developed stipule sparsely ascending-hairy ......................................... S. virgata
1. Corolla 13-25 mm; fruits 10-18(22) mm across, conspicuously longitudinally 4-winged; outerside of fully developed stipule glabrous ...................................................................................................................................... 2
2. Corolla orange-red to scarlet; fruit apex acuminate or tapering to a beak, basal stalk 5.5-8(9) X 1.1-1.6 mm; cylindric remains of hypanthium 1.5-1.9 X 1.7-2 mm, summit nearly always with a narrow to wide flange of remains of expanded portion of hypanthium ................................. S. punicea
2. Corolla yellow; fruit apex blunt to shortly acuminate to a beak, basal stalk (9)10-20 X 0.7-0.9 mm; cylindric remains of hypanthium 0.5-1.2(1.4) X 0.7-1.1 mm or uncommonly missing, summit usually lacking remains of expanded portion of hypanthium ................................................... S. drummondii