A guide to nonnative invasive plants inventoried in the north by ...

Polygonum x bohemicum
Bohemian knotweed POBO10
Form: Stout perennial up to 8 ft (2.5 m) tall. Hybrid of
Polygonum cuspidatum and P. sachalinense.
Leaves: Similar to parents. Blades ovate, 2-10 in. (5-25 cm)
long and ¾-4 in. (2-10 cm) wide, with rounded apex with
abruptly pointed tip and truncate to cordate base; lower veins
with short