Hi folks,
Just wanted you to be aware of another species that might be confused with Black swallowwort that isn't listed as a look alike on the fact sheet.
Solanum ducamera (bittersweet nightshade)
The flowers look similar but the petals are curled backwards and not fleshy.
http://en.wikipedia.org/wiki/File:Bitterweet_Nightshade_2.jpgAlso the leaves can have a smaller lobe at the base.
http://en.wikipedia.org/wiki/File:Solanum_d._young.JPGLinda
CJISST Volunteer in Monmouth County