A cactus is a member of the plant family Cactaceae, a family of the order Caryophyllales comprising about 127 genera with some 1,750 known species. The word cactus derives, through Latin, from the Anc
Cultivated cacti in the Singapore Botanic Gardens
Many species of cactus have long, sharp spines, like this Opuntia.
Ferocactus species, a cactoid, in its native Arizona habitat
Schlumbergera is a small genus of cacti with six to nine species native to the coastal mountains of southeastern Brazil. These plants grow on trees or rocks in habitats that are generally shady with h
Zygomorphic flower, probably of a cultivar in the Truncata Group, cut in half to show its internal structure
Drawing of S. russelliana, the type species, from the Botanical Magazine, 1839
S. Truncata Group 'Gold Charm'; note the very pointed teeth at the end of the segments, zygomorphic flowers held above the horizontal, and yellow pollen.