Circular gene map of Fritillaria species (Fritillaria anhuiensis, F. crassicaulis, F. dajinensis, F. davidii, F. delavayi, F. maximowiczii, F. monantha, F. przewalskii, F. sichuanica, F. unibracteata, and F. yuzhongensis) chloroplast genomes. The genes inside and outside of the circle are transcribed in clockwise and counterclockwise directions, respectively. Genes belonging to different functional groups are shown in different colors. The dashed darker gray area in the inner circle indicates genome GC content, while the lighter gray area shows AT content. IR = inverted repeat; SSC = small single copy; LSC = large single copy.