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|Catasetums are one of the few popular orchid genuses, which are well known for their beauty and floral structure.|
Catasetums exhibit sexual dimorphism. The sexual dissimilarity in the structure of staminate and pistillate flowers, often borne on separate inflorescences, or even growing at distinct seasons of the year has resulted in a nomenclatural confusion within the genus. The confusion still persists even to this present day.
Catasetum's inflorescence is borne on the basis of sex of the flowers. Inflorescence of catasetums has fleshy unisexual flowers, which is exceptional for orchids. The colorful male and yellowish-green female flowers are seen on different plants. In rare cases there are few hermaphrodite plants also. But, it is only an exception.
A characteristic feature of catasetum male flowers is the remarkable technique for the ejection of the pollinia. Trigger mechanism is one of the most unique feature among species of this highly evolved Orchids' family. The more colorful 4 inches male flowers (than female), produce a citrus fragrance. When anyone (or insect) touches the flower, the flower triggers and sends out a sticky pollinia, which is the characteristic feature of male catasetum.