FIGURE 31 in Taxonomy, evolution and phylogeography of the genus Helonias (Melanthiaceae) revisited

FIGURE 31. Geographic ranges of two sections Helonias and Heloniopsis. Ancestral plants of Helonias are presumed to have been in northern high latitudes approximate area of which is encircled with broken line. They are supposed to have been separated into two groups, and eventually one group reached eastern N. America and the other eastern Asia as consequence of their southward migrations (A). ① Sect. Helonias. ②–④ Sect. Heloniopsis. ② Subsect. Ypsilandra. ③ Subsect. Heloniopsis ser. Umbellatae. ④ Subsect. Heloniopsis ser. Heloniopsis. For historical aspect of range extension, see also Figs. 32, 33 and text (Part III).