The plastomes of Cypripedium (Orchidaceae: Cypripedioideae) exhibit atypical GC content and genome size based on different sequencing strategies

•There are two types of plastomes in Cypripedium: one resembles most other angiosperms and the other marked by IR expansion and SSC contraction.•The plastome of Cypripedium exhibits structural variations, long AT-rich regions, and great length variation (~ 72 kb) within the same genus.•Long-read seq...

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