Luxemburgieae

Schneider, Julio V., Jungcurt, Tanja, Cardoso, Domingos, Amorim, André Márcio, Töpel, Mats, Andermann, Tobias, Poncy, Odile, Berberich, Thomas & Zizka, Georg, 2021, Phylogenomics of the tropical plant family Ochnaceae using targeted enrichment of nuclear genes and 250 + taxa, TAXON 70 (1), pp. 48-71 : 61

Luxemburgieae .

— The neotropical Luxemburgieae consists of two genera, Luxemburgia and Philacra Dwyer. The latter was included in the original sampling for the present study but did not pass the final filtering. However, there is strong support for this clade from morphology ( Amaral, 1991; Amaral & Bittrich, 2014) and molecular data ( Schneider & al., 2014). Both genera are characterized by flowers that are obliquely zygomorphic already in bud. Their stamens surround the ovary only adaxially, and the filaments are basally or completely fused; staminodes are absent ( Amaral & Bittrich, 2014).

Luxemburgia is a Brazilian endemic and contains 20 species ( Feres, 2001, 2010). The only comprehensive molecular phylogenetic study to date ( Feres, 2001) was based on the internal transcribed spacer region only and did not provide any phylogenetic resolution. In the same study, a morphological cladistic analysis retrieved two main clades, separating species based on the presence or absence of a petiole, a character that was already used by Beauverd (1915) for his infrageneric classification. However, the poor phylogenetic resolution in Luxemburgia in the present study precludes the evaluation of this phylogenetic hypothesis. The poor resolution, even with the increased molecular data of this study, is most likely the result of a recent and rapid diversification, a scenario that is supported by divergence time estimation (Schneider & al., 2017).