Agrimonia gryposepala Wallr.
Common agrimony, tall hairy agrimony, hooked agrimony, tall hairy grooveburr
Common agrimony is one of several species of agrimony that are native to North America. Agrimonia may derive from the Greek argema, an eye disease that agrimony was believed to cure; gryposepala means “velcro fruit.” Okay, not exactly: grypo means “curved or hooked,” and sepala means “sepal.” It refers to the burr-like fruit.
Plants: Common agrimony is 1–6′ (30–182 cm) in height. Stems have spreading hairs (that is, they stick out from the stem, while in A. striata, they are pressed against the stem).
Leaves: Grouped into pairs of opposing leaflets, varying unevenly in size along the stem. A third leaf appears at the end of most stems. Leaflets are roughly oval in shape and coarsely toothed; their undersides are mostly hairless except for a few hairs along the major leaf vein.
Flowers: Yellow flowers appear along a narrow raceme, often tilted or even horizontal, during June-August. Individual flowers are ¼–½″ (8.4–12 mm) around, with five petals. Hairs appear along the flower stalk, but they are thinly spaced.
Fruits: Turban-shaped bristly fruits up to ½″ (1.3 cm) in size hook like burrs onto passing animals and naturalists.
Habitats: Deciduous or mixed forests, esp. in disturbed sites, such as roadsides, trails, and clearings; moist thickets and shores; fields; marshy areas.
Online References:
References:
7/25/2013 · Beaver Brook Conservation Area, Hollis, New Hampshire · ≈ 6 × 4½″ (16 × 11 cm) 
7/11/2012 · Jeff Smith Trail, Pepperell, Massachusetts · ≈ 4½ × 7″ (11 × 17 cm) 
ID is uncertain 
7/25/2013 · Beaver Brook Conservation Area, Hollis, New Hampshire · ≈ 6 × 4½″ (15 × 11 cm) 
7/11/2012 · Jeff Smith Trail, Pepperell, Massachusetts · ≈ 6 × 4″ (15 × 10 cm) ID is uncertain 
7/23/2017 · Pine Grove Furnace State Park, Pennsylvania · ≈ 4 × 6″ (11 × 16 cm) 
7/21/2024 · Woodward Point, Brunswick, Maine 
7/23/2017 · Pine Grove Furnace State Park, Pennsylvania · ≈ 8 × 5″ (20 × 13 cm) 
7/21/2024 · Woodward Point, Brunswick, Maine 
7/25/2013 · Beaver Brook Conservation Area, Hollis, New Hampshire · ≈ 8 × 5″ (19 × 12 cm) 
7/25/2013 · Beaver Brook Conservation Area, Hollis, New Hampshire · ≈ 8 × 5″ (19 × 13 cm) 
9/5/2020 · Hedgehog Mountain, Freeport, Maine · ≈ 3 × 4″ (7.9 × 11 cm) 
7/25/2013 · Beaver Brook Conservation Area, Hollis, New Hampshire · ≈ 6 × 4½″ (15 × 12 cm) 
7/23/2017 · Pine Grove Furnace State Park, Pennsylvania · ≈ 8 × 5″ (19 × 13 cm) 
7/11/2012 · Jeff Smith Trail, Pepperell, Massachusetts · ≈ 8 × 6″ (20 × 15 cm) ID is uncertain 
9/5/2020 · Hedgehog Mountain, Freeport, Maine · ≈ 6 × 4″ (15 × 11 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 | Rosidae | Roses, legumes, proteas, dogwoods, hydrangeas, mistletoes, euphorbias, grapes, many more |
| Order | Rosales | Rose family and eight others |
| Family | Rosaceae | Includes apples, apricots, plums, cherries, peaches, pears, raspberries, strawberries, almonds, roses, meadowsweets, photinias, firethorns, rowans, and hawthorns; many others |
| Genus | Agrimonia | From Greek Argemone, for plants which are healing to the eyes |
| Species | gryposepala | Means “curved or hooked sepal” |
Agrimonia gryposepala description by Thomas H. Kent, not updated.
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