Carnivorous Plant Newsletter
"Nepenthes thorelii" was formally described in 1909 by French botanist Paul Henri Lecomte, who named it after Thorel. The description was published in Lecomte's "Notulae systematicae". Since then, one infraspecific taxon of "N. thorelii" has appeared in print; "Nepenthes thorelii" f. "rubra" was mentioned by Leo C. Song in a 1979 article published in the "Carnivorous Plant Newsletter", but is considered a "nomen nudum".