| Kingdom | Plantae | Plants, but not fungi, lichens, or algae |
| Subkingdom | Tracheobionta | Vascular plants—plants with a “circulatory system” for delivering water and nutrients |
| Division | Magnoliophyta | Flowering plants, also known as angiosperms |
| Class | Magnoliopsida | Dicotyledons—plants with two initial seed leaves |
| Subclass | Asteridae | A large class that encompasses asters |
| Order | Asterales | Flowering plants with a central disk flower and surrounding petals, like daisies |
| Family | Asteraceae | The aster family, which also includes daisies and sunflowers; from the Greek ἀστήρ, “star,” for the star-shaped flowers |
| Genus | Helianthus | From Greek helios, “sun,” and anthos, “flower,” because it was believed that sunflowers turn to follow the sun |
| Species | hirsutus | Covered with hair |
Helianthus hirsutus Raf. var. stenophyllus Torr. & A. Gray
Helianthus hirsutus Raf. var. trachyphyllus Torr. & A. Gray
Helianthus stenophyllus (Torr. & A. Gray) E.E. Watson
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