( Unfortunately ( , ( this ( ( is ( ( an ( invasive ( exotic species ) ) ) ( called ( Purple loosestrife ) ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB Unfortunately)) (, ,) (NP (DT this)) (VP (VBZ is) (NP (NP (DT an) (JJ invasive) (JJ exotic) (NN species)) (VP (VBN called) (S (NP (NNP Purple)) (ADJP (JJ loosestrife)))))) (. .)))
Unfortunately, this is an invasive exotic species called Purple loosestrife.
(ROOT (S (NP (JJ Exotic) (NNS species)) (VP (VBP are) (ADVP (RB also)) (VP (VBN called) (NP (JJ invasive) (NNS species)) (SBAR (IN because) (S (NP (PRP they)) (VP (VBP threaten) (NP (JJ other) (NNS species))))))) (. .)))