Japanese hedgeparsley flower and leaf

Japanese hedgeparsley (Torilis japonica)

Herbaceous biennial in the carrot family, with white umbel flowers and pasley-like leaves. Flowering plants are branched and grow 2-6 feet tall.

Overview

Regulated areas of Japanese hedgeparsley
Japanese hedgeparsley is Prohibited (Red counties) and Restricted (Orange counties)

Other names for this plant include:

  • Common names: erect hedgeparsley, upright hedgeparsley
  • Scientific names: T. anthriscus; T. rubella; Caucalis japonica

Ecological threat:

  • Hedgeparsleys invade forests, grassland, hedgerows, and roadsides.
  • Currently, only Japanese hedgeparsley is known in Wisconsin.
  • Pets, such as dogs, and other animals appear to be spreading Japanese hedgeparsley quickly throughout the state.

Classification in Wisconsin: Prohibited/Restricted

Species Assessment Groups (SAG) were assembled to recommend a legal classification for each species considered for NR 40. The recommendation for Japanese hedgeparsley was based upon this literature review developed by the department.

Identification

Leaves: First-year plants have low-growing, parsley-like rosettes that stay green until late fall. Second-year plant leaves are alternate, compound, fern-like, 2-5 inches long and slightly hairy.

Flowers: Flowers are tiny and white, growing in small, open, flat-topped umbels. Has 2 or more bracts at the base of each umbel. Blooms in July and August.

Fruits & seeds: The small fruit, ripens quickly, and is covered in hooked hairs that attach to clothing and fur.

Roots: Taproot.

Similar species: Queen Anne's lace or wild carrot (Daucus carota; non-native)—a widespread weed in Wisconsin—has similar finely-divided leaves, but leaves and stems are quite hairy and when crushed smell like carrots. Other look-alikes include wild chervil (Anthriscus sylvestris; invasive), caraway (Carum carvi; non-native), poison hemlock (Conium maculatum; invasive), Chinese hemlock parsley (Conioselinum chinense; non-native), sweet cicely (Osmorhiza spp.; native) and spreading hedge parsley. Spreading hedge-parsley (Torilis arvensis; invasive) is not currently known in Wisconsin, but nationally is more common than T. japonica. It looks very similar to Japanese hedge-parsley but lacks the pointed bracts at the base of each umbel.

Distribution

Known county distribution of Japanese hedgeparsley
Counties in WI where Japanese hedgeparsley has been reported (as of June 2013). Both vouchered and unvouchered reports included.

Do you have Japanese hedgeparsley in your county but it isn't shaded on the map? Send us a report.

Control

Mechanical: Pull or mow prior to flowering.

Chemical: Treat foliage with glyphosate, triclopyr, or metsulfron methyl in early spring or on plants that are resprouting after having been cut.

For more information on control techniques, visit the Hedgeparsley factsheet [exit DNR] by University of Wisconsin-Extension.

Photos

View Japanese hedgeparsley pictures in our photo gallery!

Resources

Sources for content:

  • Czarapata, Elizabeth; Invasive Plants of the Upper Midwest: an illustrated guide to their identification and control. University of Wisconsin Press. 2005. Pg. 140
  • Fewless, Gary. Herbarium, Coffrin Center for Biodiversity, UW-Green Bay. Invasive Plants of Wisconsin. Torilis japonica [exit DNR].
  • Invasive Plant Atlas of the United States. Japanese hedgeparsley [exit DNR]. Last updated December 21, 2011.

Links for More Information

Last revised: Wednesday June 05 2013