It should be noted that acylation is one of the important taxo-
nomic markers between sub-clusters A and B due to its contribu-
tion to Z1 at a relatively high eigenvector correlation (0.7974)
(Supplementary material 1). Except for C. azalea, members of
sub-cluster B displayed over 63% acylation, and members of sub-
cluster A displayed under 51% acylation, with the exception of C.
hongkongensis and C. boreali-yunnanica.