Species of orchid or any other plant ,flower can look the same but can be genetically different.Scientists have developed a "barcode" gene that can be used to distinguish between the majority of plant species has been identified.This gene can be used to catalogue plant life as it has a slightly different code between species but is nearly identical within a species. Species that look the same to the human eye can be told apart with a small leaf sample. DNA barcoding is already a very well-established technique in animals.
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