Anemone canadensis L.
Canada anemone, round-leaf thimbleweed, windflower, meadow anemone, roundleaf anemone
The Canadian anemone is also found throughout the northern US, except west of the Rocky Mountains.
Plants: Up to 9–24″ (22–60 cm) in height. Each stem is hairy, and has a single group of 3- to 5-parted leaves.
Leaves: Leaves near the base are deeply divided.
Flowers: These members of the buttercup family have flowers that look a bit like white buttercups, with pale yellow centers. Each flower is 1–1½″ (2.5–3.8 cm) in diameter, with five white petals (well, sepals that look like petals). Flowers occur in groups of one to three.
Fruits: Achenes—that is, the fruit encloses a single large seed. They are about ⅛–3/16″ (4–6 mm) in size.
Habitats: River margins, river flood plains, low moist meadows, ditches and moist thickets.
Edibility: Poisonous. 
Symptoms: inflammation and blistering
upon contact with fresh sap; irritation and pain in the mouth, vomiting and diarrhea following ingestion.
Online References:
Anemonidium canadense (L.) Á. Löve & D. Löve
5/22/2010 · Garden in the Woods, Framingham, Massachusetts · ≈ 14 × 9″ (35 × 23 cm) 
ID is uncertain 
6/3/2014 · Bates Land and Blackman Land, Groton Conservation Trust, Groton, Massachusetts · ≈ 7 × 10″ (16 × 25 cm) 
6/15/2010 · Garden in the Woods, Framingham, Massachusetts · ≈ 14 × 12″ (35 × 29 cm) ID is uncertain 
6/3/2014 · Bates Land and Blackman Land, Groton Conservation Trust, Groton, Massachusetts · ≈ 8 × 5″ (19 × 13 cm) 
6/15/2010 · Garden in the Woods, Framingham, Massachusetts · ≈ 7 × 4½″ (17 × 11 cm) ID is uncertain 
6/3/2014 · Bates Land and Blackman Land, Groton Conservation Trust, Groton, Massachusetts · ≈ 8 × 5″ (19 × 12 cm) 
6/17/2007 · Presque Isle, Maine · By Constance B. Kent 
| 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 | Magnoliidae | Includes magnolias, nutmeg, bay laurel, cinnamon, avocado, black pepper, and many others |
| Order | Ranunculales | Basal (evolved earlier) eudicots, also called “true dicots” |
| Family | Ranunculaceae | Buttercup family |
| Genus | Anemone | From Greek anemos, “wind” |
| Species | canadensis | “From Canada” |
Anemone canadensis description by Thomas H. Kent, not updated.
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