In an older paper, Reznik (1957) studied flower pigments from 37 Conophytum samples and found three main pigments: one betaxanthin (in samples with yellow flowers) and two betacyanins (betanin 1 in samples with purple flowers and betanin 2 in one sample with rose-purple flowers), as well as 6 flavonols as co-pigments. Here, the results from Reznik (1957) and related older studies are compared with more recent morphological-phylogenetic studies (Opel 2005b) with regard to the agreement or deviation with respect to subdivisions of the genus Conophytum. The mutually exclusive distribution of two flavonols in Conophytum is phylogenetically informative: flavonol 1 is restricted to the basally diverging lineages of the Biloba Grade (including Conophytum taylorianum), and flavonol 2 was found in the group containing the remainder of Conophytum, probably indicating monophyly. In conjunction with phylogenetic data of Opel (2005b), floral pigment data suggest that Conophytum sect. Biloba could be provisionally recognized as a possibly paraphyletic assemblage comprising all members of the Biloba Grade including C. taylorianum but excluding C. herreanthus, and that sect. Herreanthus should encompass C. herreanthus only.
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