Bastard-senna, in botany, a genus of the diadelphia decandria clas. The pod is inflated, and opens at the top; and the calix is bilabiate. The species are three, none of them natives of Britain.

COLOMBUS, the Diver, in ornithology, a genus belonging to the order of anseres. The bill has no teeth, is tubulated, strait, and sharp-pointed; the teeth are in the faux or throat; the nostrils are linear, and at the base of the bill; and the legs are unfit for walking. There are eleven species, viz. 1. The grylle, with palmated and three-toed feet, a red body, and the covering feathers of the wings white. It flies very low, and is a native of Greenland. 2. The troile, with palmated three-toed feet, a black body, a white breast and belly, and the secondary prime feathers of the wings white at the points. It is found within the arctic circle. 3. The leptentrionalis, with palmated four-toed feet, and an iron-coloured spot under the neck. It is a native of the northern lakes of Europe. They build their nests upon the shore without art, and lay a couple eggs: they run with great quickness upon the water; and preface storms by flying and crying with a miserable tone of voice. 4. The arcticus, with palmated four-toed feet, a hoary head, and a violet neck. It frequents the northern seas and lakes. 5. The glacialis, with palmated four-toed feet, and a violet head and neck. It inhabits the northern seas. 6. The immer, with palmated four-toed feet, the upper part of the body black and undulated with white, and a white belly. It inhabits the frozen seas. 7. The crytalus, with lobated feet, a red head, a black collar, and white secondary prime wing-feathers. It is a native of Europe. 8. The auritus, with lobated feet, a black head, and the ears are crested and of an iron colour. It frequents the lakes of Europe and America. 9. The urinator, with lobated feet, a smooth head, and white spots on the wings. It is a native of the southern parts of Europe. 10. The dominicus, with lobated feet, a smooth head, and the belly very much spotted. 11. The padiceps, with lobated feet and a yellowish body. It is a native of North America.