Cephalium
Encyclopedia
Cephalium is a, frequently brightly coloured, structure of wool and bristle at the growing tip of certain cacti
Cacti
-See also:* RRDtool The underlying software upon which Cacti is built* MRTG The original Multi Router Traffic Grapher from which RRDtool was "extracted".* Munin -External links:******...

. It is most commonly found on cacti of the genus Melocactus
Melocactus
Melocactus is a genus of cactus with about 40 species. They are native to the Caribbean, northern South America, with some species along the Andes down to southern Peru, and a concentration of species in northeastern Brazil....

and can take a number of colours, forms and shapes.
The cephalium will only begin growing after a cactus has reached a certain size or age. Once flowering begins the flower buds will form from the cephalium.
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