 The genus <unk> was first described Carl <unk> <unk> in 1816 based on specimens collected by Alexander von Humboldt and Aimé <unk> , although older , pre @-@ <unk> descriptions exist , including Charles <unk> 's 1703 description of A. <unk> . The genus was named for <unk> III <unk> , king of <unk> , known for his interest in <unk> plants . The type species is A. <unk> , a Colombian endemic . The genera <unk> and <unk> were described by Carl Friedrich Philipp von <unk> in 1826 and 1837 respectively . <unk> was described by Hermann <unk> in 1857 , and <unk> by <unk> F. Cook in 1942 . 
