Figure 4 from: Krings A, Morillo Pacheco G (2014) A new species and a new combination in Phaeostemma (Apocynaceae, Asclepiadoideae, Gonolobinae). PhytoKeys 33: 41-50. https://doi.org/10.3897/phytokeys.33.6453 - Morillo Pacheco, Gilberto (2014)