|Other names:||lady's-thumb, spotted smartweed, ladysthumb smartweed, smartweed, spotted ladysthumb, spotted knotweed|
Lance-like leaves on multibranched stems with a low, spreading habit. Young leaves and stems are reddish, and leaves usually display a blotch of dark pigment. Knobby flowers are clustered along spikes at ends of stems. Prefers wet soils.