Virginia Tech Weed Identification Guide

Poorjoe or Common Buttonweed: Diodia teres

Weed Description:   Erect or spreading annual with opposite, linear leaves and small white flowers. Found throughout the southeastern United States.
Leaves:  Linear or elliptic, 3/4-1 1/2 inches long, 2-6 mm wide, opposite, without petioles, with a prominent midvein on both surfaces. Leaves are connected across the stem by a membrane that has several long (3-5 mm) hairs connected to it.
Stems:  Hairy, and most often occur prostrate and spreading along the ground.
Flowers: Arise from a region between the stem and leaf (axillary), usually solitary, star-shaped, and consist of 4 small white sepals.
Identifying Characteristics:   Prostrate growth habit, small, white, 4-parted flowers, and membrane connecting each pair of opposite leaves helps to distinguish this plant from most other weeds.   However, Virginia Buttonweed (Diodia virginiana) is very similar in growth habit and appearance but is a perennial with much wider leaves and stems that root at the nodes.