Boston Ivy (Parthenocissus tricuspidata)
A member of the grape family and a very close relative of Virginia Creeper, Boston Ivy bears these beautiful (but poisonous) berries. Its flowers are tiny and insignificant. The leaves are the main attraction; they are usually very similar to grape leaves, but occasionally divided into three leaflets.
Parthenocissus tricuspidata is an Asian import; it is not listed, except in passing, in any of our standard botanical references, but it is plentifully naturalized in the city of Pittsburgh and inner suburbs. According to the USDA PLANTS database, it is unknown in the wild in our area outside Allegheny County.
These vines sprawled over a chain-link fence in the back streets of Oakland, where they were blooming and fruiting in the middle of October.