epiphyllum

from The Century Dictionary.

• noun A Brazilian genus of low cactaceous plants, with numerous branches formed of short, flattened, bright-green joints, bearing showy rose-red flowers at the summit. There are three species. E. truncation and E. Russellianum are frequently cultivated in greenhouses.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Bot.) A genus of cactaceous plants having flattened, jointed stems, and petals united in a tube. The flowers are very showy, and several species are in cultivation.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A cactus of the genus Epiphyllum.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun any cactus of the genus Epiphyllum having flattened jointed irregularly branching stems and showy tubular flowers