Adventitious

Adventitious roots are those which do not appear in the usual place on a plant.

Someone with a positive manner, perhaps a detective, used the expression "mad man" as he bent over Wilson's body that afternoon, and the adventitious authority of his voice set the key for the newspaper reports next morning.

His arrivals were always adventitious, leaving others little time to prepare.

A rather adventitious source informed me of his past doings.

The discovery of the art of making pottery was probably in all cases adventitious, the clay being first used for some other purpose.

The adventitious disappearance of those nearer the throne than the duke had, moreover, set tongues awagging.

The Velloziaceae have evolved a woody stem which is covered with a layer of adventitious roots mingled with the fibres of the old leaf sheaths;