Pitcher Plants of the Old World
"Nepenthes smilesii" was referred to as "N. anamensis" throughout most of the 20th century. Further confusion resulted from the erroneous labelling of "N. smilesii" plants as "N. thorelii" in the horticultural trade. In "Pitcher Plants of the Old World", Stewart McPherson lists "N. mirabilis" f. "smilesii" and "N. mirabilis" var. "smilesii" as synonyms of "N. smilesii", but Marcello Catalano considers these to represent normal forms of "N. mirabilis".