Figure 21.14 Same Common Name, Not the Same Species All three of these distinct plant species are called “Indian paintbrush.” Binomial nomenclature allows us to avoid the ambiguity of such common names and communicate exactly what is being described. (A) Asclepias tuberosa is a perennial milkweed native to eastern North America. (B) Castilleja coccinea is also native to eastern North America, but is a member of a very different group of plants called scrophs. (C) Hieracium aurantiacum is a European species of aster that has been widely introduced into North America.