Figure 4 from: Ruiz-Domínguez C, Vovides AP, Sosa V (2019) Systematic relevance of pollen morphology in tribe Hylocereeae (Cactaceae). PhytoKeys 128: 121-140. https://doi.org/10.3897/phytokeys.128.35842 - Ruiz-Domínguez, Catalina (2019)