A genus of woody twiners with irregular and grotesque flowers, one species being a native of California. Aristolochia sipho, commonly called The Dutchman's Pipe, is a very rapid grower, sometimes making over twenty feet in a single season.

They like a warm sheltered situation and plenty of water at the root during the growing season.

Propagate by cuttings, in September, placed in pots filled with sandy leaf-mold, in a cool frame, and shaded from the sun until rooted; when they are rooted, pot them in three-inch pots and plant them out the following Spring.