| 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 | Urticales | Includes cannabis, nettles, mulberries, elms, others |
| Family | Urticaceae | Nettle family |
| Genus | Parietaria | Derives from the Latin parietarius, “of walls,” which descends from Greek paries, “a wall,” where the plant likes to grow, as Pliny knew when he described it |
| Species | pensylvanica | Of or from Pennsylvania |
Parietaria obtusa Rydb. ex Small
Parietaria occidentalis Rydb.
Parietaria pensylvanica Muhl. ex Willd. var. obtusa (Rydb. ex Small) Shinners
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