Addition to Aoki et al. (2017): phylogenetic position of Oxalis trilliifolia in subsection Oxalis (Oxalidaceae)

Oxalis trilliifolia Hooker (1831:118; as “trilliifolium”) is distributed in western North America. The species was previously treated in a monotypic genus as Hesperoxalis triliifolia (Hook.) Small (1907: 27). However, it was recently included in Oxalis subsect. Oxalis by Lourteig (2000). It was the only species that could not be included in our previous phylogenetic analysis of O. subsect. Oxalis (Aoki et al. 2017). After the publication of our previous study, we obtained one DNA sample of O. trilliifolia from the DNA Bank of the Missouri Botanical Garden, i.e., MO-275113, which was collected from Oregon, USA. We confirmed a duplicate sheet of its voucher specimen that was deposited in herbarium P (Porter P. Lowry II 5059), even though we were unable to find the voucher specimen at MO. Therefore, its phylogenetic position was provided here, following the protocol from our previous study (Aoki et al. 2017).