Page authors: Don Knoke, David Giblin
Persicaria maculosa
heartweed, lady's-thumb, spotted lady's-thumb, redshank

Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast.

Habitat: A weedy species, usually on moist, cultivated or otherwise disturbed soil.

Flowers: March-September

Origin: Introduced from Eurasia

Growth Duration: Perennial

Conservation Status: Not of concern

Pollination: Bees, flies


Usually a glabrous annual, simple to branched, erect to spreading, up to 1 m. tall.


Leaf blades elliptic-lanceolate to narrowly oblong-lanceolate, 5-10 cm. long, usually with a purplish triangular or lunar spot about mid-length, narrowed to a short, thick, non-jointed petiole; stipules obliquely cylindric-conic, never lacerate, bristly along the nerves.


Inflorescence of crowded, pedunculate, compound racemes; flowers white, usually strongly pinkish-tinged; perianth 1.5-2 mm. long, 5-parted.

Identification Notes:

Achene lenticular, 2-2.5 mm. long, ovate-rotund in outline, black, smooth and shining.

Accepted Name:
Persicaria maculosa Gray
Publication: Nat. Arr. Brit. Pl. 2: 269. 1821.

Synonyms & Misapplications:
Polygonum persicaria L. [HC]
Additional Resources:

PNW Herbaria: Specimen records of Persicaria maculosa in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Persicaria maculosa checklist entry.

OregonFlora: Persicaria maculosa information.

E-Flora BC: Persicaria maculosa atlas page.

CalPhotos: Persicaria maculosa photos.

USDA Plants: Persicaria maculosa information.

35 photographs:
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