Galeopsis tetrahit L.
Common hemp-nettle, brittlestem hempnettle
Common hemp-nettle is native to Europe and Asia, now widespread and often considered invasive in North America.
Plants: 6–28″ (15–70 cm) tall, with branched stems that have hairs that are bent backward (retrorse).
Leaves: Opposite, with stems about ⅜–1″ (1–2.6 cm) long, elliptic to ovate, 1–4 ⨉ ⅜–1¾″ (3–10 ⨉ 1–5 cm). They have short stiff hairs and crenate edges.
Flowers: Tubular and bilaterally symmetrical, appearing from June to September. They are purple with white centers or white with pink/purple centers, or just plain white.
Fruits: A four-chambered schizocarp.
Habitats: Disturbed soils, well-lit forest floors, roadsides.
Edibility: Poisonous 
Online References:
8/17/2014 · Bald Mountain, Franconia Notch Area, White Mountains, New Hampshire · ≈ 8 × 6″ (20 × 14 cm) 
8/14/2021 · Maquoit Bay Conservation Area, Brunswick, Maine · ≈ 3 × 5″ (8.4 × 12 cm) 
8/17/2014 · Bald Mountain, Franconia Notch Area, White Mountains, New Hampshire · ≈ 7 × 4½″ (17 × 12 cm) 
8/7/2013 · Amos Kendall Conservation Land, Dunstable, Massachusetts · ≈ 8 × 6″ (20 × 14 cm) 
8/14/2021 · Maquoit Bay Conservation Area, Brunswick, Maine · ≈ 5 × 3½″ (13 × 9 cm) 
8/17/2014 · Bald Mountain, Franconia Notch Area, White Mountains, New Hampshire · ≈ 6 × 5″ (16 × 13 cm) 
8/7/2013 · Amos Kendall Conservation Land, Dunstable, Massachusetts · ≈ 8 × 6″ (20 × 14 cm) 
8/14/2021 · Maquoit Bay Conservation Area, Brunswick, Maine · ≈ 6 × 4″ (16 × 10 cm) 
8/7/2013 · Amos Kendall Conservation Land, Dunstable, Massachusetts · ≈ 6 × 4″ (16 × 10 cm) 
8/7/2013 · Amos Kendall Conservation Land, Dunstable, Massachusetts · ≈ 6 × 9″ (16 × 23 cm) 
8/14/2021 · Maquoit Bay Conservation Area, Brunswick, Maine · ≈ 4 × 2½″ (10 × 7 cm) 
| Kingdom | Plantae | Plants, but not fungi, lichens, or algae (from Stearn's Botanical Latin) |
| 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 | Lamiales | Aromatic herbs and shrubs, including lavender, lilac, olive, jasmine, ash, teak, snapdragon, sesame, psyllium, garden sage, mint, basil, and rosemary |
| Family | Lamiaceae | Mint family |
| Genus | Galeopsis | Means “looks like a weasel,” for the vague resemblence of the corolla |
| Species | tetrahit | “Four-parted,” probably for the plant’s ovary |
Galeopsis tetrahit description by Thomas H. Kent, not updated.
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