↳ Plants

 (Kingdom Plantae)

 ↳ Vascular Plants

 (Phylum Tracheophyta)

   ↳ Flowering Plants

 (Subphylum Angiospermae)

    ↳ Monocots

 (Class Liliopsida)

     ↳ Agaves, Orchids, Irises and Allies

 (Order Asparagales)

      ↳ Orchids

 (Family Orchidaceae)

       ↳ Lower Epidendroid Orchids

 (Subfamily Epidendroideae)

        ↳ Tribe Arethuseae

         ↳ Bamboo Orchids, Grasspinks, and Dragon's Mouths

 (Subtribe Arethusinae)

          ↳ Grasspinks

 (Genus Calopogon)

           ↳ Tuberous Grasspink

 (Calopogon tuberosus)

            ↳ Simpson's Grasspink

 (Calopogon tuberosus var. simpsonii)

            ↳ Common Tuberous Grasspink

 (Calopogon tuberosus var. tuberosus)