Mile-a-minute weed
Persicaria perfoliata · Polygonaceae (Knotweed family)
AI-generated identification · may be incorrect
Leaf Morphology
Leaf Type
Simple, deciduous
Shape
Distinctive triangular or peltate (arrowhead-like) shape with prominent pointed lobes at the base
Margin
Entire and smooth
Arrangement
Alternate along the slender, trailing stems, featuring characteristic circular, cup-shaped ocreae that clasp the stem
Venation
Palmate-pinnate reticulate venation with a prominent pale green midrib and primary veins
Key Features
Triangular (peltate) leaves, prickly backward-pointing barbs on stems and leaf stalks, and prominent circular cup-like ocreae wrapping around the stem at nodes
Description
Persicaria perfoliata is an aggressive, fast-growing annual vine capable of smothering other vegetation. It features slender, branching stems covered in downward-curving barbs that allow it to scramble high over shrubs and small trees. The leaves are remarkably shaped like equilateral triangles with shield-like attachment, and the plant produces showy, funnel-shaped leafy structures called ocreae surrounding the stem.
Habitat
Disturbed areas, forest edges, open fields, stream banks, and roadsides in moist to damp soils with high sun exposure
Native Range
Native to eastern Asia including China, Japan, Korea, and the Philippines; introduced to North America where it is considered a noxious invasive weed