Coefficient of Conservatism:
Coefficient of Wetness:
Roadsides, trails, clearings, and other disturbed areas of upland forests and swamps. A European species, rather recently established as a weed in our area. First collected in Michigan in 1952 in Clinton and Eaton Cos.; by 1977 abundant in central Emmet Co. and the Lansing area (Ingham Co.), and known from a number of other counties.
The similar Torilis arvensis (Huds.) Link is established locally in a few areas of the Great lakes region, and doubtless will spread into Michigan. It has the primary umbels lacking bracts or with just one bract and the bristles on the mericarps spreading with the apex enlarged and often ± hooked; T. japonica has usually 2 or more bracts on the main umbel and the bristles of the mericarps ascending and tapered to the ± straight apex.