https://www.eealliance.org/mon...
https://www.fs.fed.us/wildflow...
Plant Description: Single, un-branched stalk that is 50-200 cm tall.
Leaves opposite on stalk, 10-25 cm long and 3-10 cm wide. Flowers white to pink. 2 to 6 umbels from the upper nodes. Each umbel is 5-10 cm broad. Seed pods are 8-12 cm long and 2.5-3.5 cm broad.
Bloom Period: June through August
Seeds: July through September
Habitat: Meadows, fields and roadsides
Range: Present but rare in northwest region of state
