| 1A. | Leaf rachis winged, pubescent, leaflets 4–8 pairs per leaf, pubescent, frequently with minute red glands abaxially; calyx tube up to 1.5 cm long: stamens 60–130; pod 5–20 cm long, cylindrical or quadrangular | I. vera ssp. vera |
| 1B. | Leaf rachis subcylindrical, glabrous, leaflets 3–4 pairs per leaf, glabrous; calyx tube 1.5–1.75 cm long; stamens 45–60; pod 14–40 cm long, sub-oblong, laterally flattened | I. inicuil |
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