Rambling cactus with large conical root. The Arizona Queen of the Night has thin stems and large underground tuber that supposedly can reach 100 pounds. They open at night in June, lasting only one night. They can be sown at any time of the year. The seedlings rot easily, keep in dry air and strong light.
Cuttings are also very easy.
This site contains information and pictures for more than 2000 species of plants. The CD of the site Enjoy the much larger pictures.