Lepidium perfoliatum
Encyclopedia
Lepidium perfoliatum is a species of flowering plant in the mustard family
Brassicaceae
Brassicaceae, a medium sized and economically important family of flowering plants , are informally known as the mustards, mustard flowers, the crucifers or the cabbage family....

 known by the common name clasping pepperweed. It is native to Europe and Asia and it can be found in other parts of the world as an introduced species
Introduced species
An introduced species — or neozoon, alien, exotic, non-indigenous, or non-native species, or simply an introduction, is a species living outside its indigenous or native distributional range, and has arrived in an ecosystem or plant community by human activity, either deliberate or accidental...

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This is an annual or biennial herb producing an erect stem to a maximum height near 60 centimeters. Leaves at the base of the plant are divided into linear lobes, while the leaves higher up on the stem are rounded to oval in shape and surround the stem. The tip of the stem is occupied by an inflorescence
Inflorescence
An inflorescence is a group or cluster of flowers arranged on a stem that is composed of a main branch or a complicated arrangement of branches. Strictly, it is the part of the shoot of seed plants where flowers are formed and which is accordingly modified...

of very small flowers, each with yellow petals only 1 or 2 millimeters long. The fruit is a flattened oval or diamond-shaped capsule about 4 millimeters long.

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