Cephalium is a frequently brightly coloured structure of wool and bristle at the growing tip of certain cacti. It is most commonly found on cacti of the genus Melocactus 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.
Flowers emerge from cephalium of Arrojadoa penicillata.
Cephalium of Melocactus matanzanus
Lateral cephalium of Espostoa lanata
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