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Six representative plastomes of Orchidaceae. Cypripedium formosanum has the longest plastome (178.1 kb), while Epipogium roseum has the shortest. Gastrodia elata and Epipogium roseum hold 27 genes in their plastome, even though they have substantially different plastome sizes. The heavy vertical bars indicate inverted repeat (IR) regions and the broken lines among plastomes indicate the boundaries of IR and single copy regions.
