Plant material
Seventy-six herbarium
specimens identified as D. communis or D. orientalis were
used to obtain genomic, spatial, and morphometric data. They were
selected as being representative of the macromorphological diversity and
geographical distribution ranges of the two species as currently
circumscribed (Supplementary Data Table S1). The genomic sampling also
included material that were used as outgroup taxa, comprising the two
species from the Borderea clade (D. chouardii and D.
pyrenaica ), which is sister to the Tamus clade (Viruel et al .,
2016), and two members of the more distantly related African clade
(D. elephantipes (L’Hér.) Engl. and D. sylvatica Eckl.).