From Elements of Botany:
"Robinia viscosa, a native of the southern parts of the United States. This plate furnishes us with a good example of the pinnate leaf (folium pinnatum), and of that species which Linnæus denominates folium pinnatum cum impari; unequally pinnate, when the wings composed of leaflets are terminated by a single leaflet... A. The seed-vessel, which is a legume (legumen). B. The same opened, showing the two valves of which it consists, and the seeds fixed along one of the sutures."