Fig. 1. Flowers. A, C, E in Hoya of Sumatra, an updated checklist, three new species, and a new subspecies

Fig. 1. Flowers. A, C, E. Top view of the flower. B, D, F. Side view of the flower, with part of corolla removed. A–B. H. danumensis subsp. amarii S.Rahayu & Rodda subsp. nov. (Amar Husein Sitompul s.n. leg., BO). C–D. H. solokensis S.Rahayu & Rodda sp. nov. (Fadly s.n. leg., BO). E–F. H. rigidifolia S.Rahayu & Rodda sp. nov. (S. Rahayu 865 leg., BO). Drawing: X. Y. Loh.Published as part of Rahayu, Sri & Rodda, Michele, 2019, Hoya of Sumatra, an updated checklist, three new species, and a new subspecies, pp. 1-23 in European Journal of Taxonomy 508 on page 5, DOI: 10.5852/ejt.2019.508, http://zenodo.org/record/261287