european swallow-wort - cynanchum rossicum

america angiosperms apocynaceae bane black bloom blooming blossom botany canada canadian conservation cynanchum dog dogbane environment environmental european family flora floral flowers gentianales horticulture living mills natural nature north ontario organism outdoors outside pale park petal plants pretty purple rossicum strangling swallow swallowwort todmorden toronto urban vine wild wildflowers wort invasive species