Cactus on our Window

I always love plants. One of them are the family of cactus. I have a lot now sitting on our window pane. here is one kind of cactus I got..any idea what is its particular name? I know before but since I left home almost six years ago, I cannot remember some names anymore. thanks in advance..

A cactus (plural: cacti or cactuses) is any member of the spine plant family Cactaceae, native to the Americas. They are often used as ornamental plants, but some are also crop plants. Cacti are part of the plant order Caryophyllales, which also includes members like beets, baby's breath, spinach, amaranth, tumbleweeds, carnations, rhubarb, buckwheat, plumbago, bougainvillea, chickweed and knotgrass.

Cacti are distinctive and unusual plants, which are adapted to extremely arid and hot environments, showing a wide range of anatomical and physiological features which conserve water. Their stems have expanded into green succulent structures containing the chlorophyll necessary for life and growth, while the leaves have become the spines for which cacti are so well known. source: http://en.wikipedia.org/wiki/Cactus

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