- Tripleurospermum perforatum annual herb/forb that can grow up to 2 ft. (0.6 m) tall.
- Stems are erect, branched, yellowish-green, and occasionally flushed with reddish-purple. Leaves are rosette, oblong-spathulate, thread-like, irregularly tripinnate, and branched segments are 0.02-0.04 in. (0.6-1 mm) wide.
- Flower heads have white ray flowers and yellow centers, and are disc shaped. A key feature of this species is that its flowers are almost completely scentless. Flowering occurs from June to October.
- Fruit are 0.1-0.14 in. (2.5-3.5 mm) long, dry, brown in color, and triangular in shape with ribbed venation. Seeds are gray to black or dark brown and 0.06 in. (1.5 mm) long.
- Ecological Threat
- Tripleurospermum perforatum can be found along roadsides and in fields particularly in locations with colder climates. It is native to northern Europe.
Images from Bugwood.org