Common Venus' Looking-glass: Triodanis perfoliata
|Weed Description: An erect
winter or summer annual with leaves that clasp the stem and purple flowers. Common
Venus' looking-glass is primarily a weed of landscapes, lawns, turfgrass, and occasionally
pastures and hay fields. This weed is found throughout the United States.
Stems: Erect, branched, hairy, reaching as much as 1 1 /2 feet in height.
|Leaves: Leaves are rounded to
oval in outline, distinctly clasping the stem to the point that they appear to completely
enclose the stem. Leaves range from 1/4 to 1 1/2 inches in length and from 6 to 25
mm in width. Leaf margins are usually slightly serrated or toothed.
Roots: A fibrous root system.
|Flowers: Occur in clusters of 1
to 3 in the positions between the leaves and stems. Flowers consist of 5
purple petals that are collectively approximately 3/4 inch wide. Flowers do not
occur on flower stalks (peduncles).
Fruit: A long, narrow capsule containing many very small (0.5 mm long), reddish seed.
|Identifying Characteristics: The round or oval leaves that almost completely encircle the stem and the distinctive purple flowers are both characteristics that help to distinguish common Venus' looking-glass from most other weeds.|