| 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 | Rosidae | Roses, legumes, proteas, dogwoods, hydrangeas, mistletoes, euphorbias, grapes, many more |
| Order | Myrtales | Includes myrtles, leadwoods, loosestrifes, pomegranates, evening primroses, many others |
| Family | Onagraceae | Willowherb/evening primrose family |
| Genus | Oenothera | Derivation uncertain: 1. Greek ονος θηρας (onos theras), or “donkey catcher.” 2. Or οινος θηρας (oinos theras), “wine seeker.” 3. Or Latin oenothera, “a plant whose juices may cause sleep” |
| Species | fruticosa | From Latin frutex, “a shrub”: shrubby or bushy |
| ssp. | tetragona | From Greek meaning “bluish-gray,” referring to a “bloom” or whitish powdery covering on leaves |
Oenothera tetragona
Oenothera fruticosa (Michx.) H. Lév. var. glauca
Oenothera glauca Michx.
Kneiffia glauca (Michx.) Spach
Kneiffia hybrida (Michx.) Small
Kneiffia latifolia Rydb.
Kneiffia tetragona (Roth) Pennell
Oenothera fruticosa L. ssp. glauca (Michx.) Straley
Oenothera riparia Nutt.
Oenothera tetragona Roth var. fraseri (Pursh) Munz
Oenothera tetragona Roth ssp. glauca (Michx.) Munz
Oenothera tetragona Roth var. hybrida (Michx.) Fernald
Oenothera tetragona Roth var. latifolia (Rydb.) Fernald
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