Norway Maple (Acer platanoides) Japanese Barberry (Berberis ...

Status: Invasive.
Periwinkle (Vinca minor)
Native to: Europe and North Africa.
Effects: Common periwinkle invades open to shady
forests, often near homes where it was planted as an
ornamental. It forms dense and extensive mats along
forest floors that exclude native vegetation.
http://en.wikipedia.org/wiki/File:Vinca_minor_Nashvillle.jpg
Distinctive features: This plant grows as a creeping
vine, typically not rising more than a few inches off the
ground. The stems, which are slender and green in color,
root at the nodes as they creep along the ground. The
opposite, glossy leaves are approximately 1 inch long and
elliptical in shape. The distinctive bluish-lavender
flowers are funnel-shaped with five flaring lobes
(petals) and about 1” wide. Flowering starts in late spring
and flowering continues in throughout the summer. It
can be distinguished from the similar, greater
periwinkle, which is also invasive, because its leaves are
smaller and lack hairs on their edges.
Status: Invasive.
Native to: Europe.
English Ivy (Hedera helix)
Effects: When climbing trees, this vine can block light
from the tree’s leaves, eventually killing the tree. The
additional weight of the vine also makes the trees more
vulnerable to blowing down in storms. When growing
along the ground it can often grow so densely that none
of the native plants are able to coexist with it.
http://www.freewebs.com/dryadia/Ivy%20(English%20Ivy)%20
Hedera%20helix.jpg
http://www.englishivy.net/images/English%20Ivy%202.jpg
Distinctive features: This evergreen plant is often
found climbing trees, brickwork, and other surfaces by
way of small root-like structures which exude a sticky
substance. Older vines can reach one foot in diameter
at their bases. The waxy and somewhat leathery leaves
are usually three-lobed and dark green with white veins.
They are arranged alternately along the stem. An
unlobed, rounded leaf is often found on mature vines. In
mature plants, pale yellow-green flowers are produced
at the ends of each branch the fall and these produce
clusters of black-purple fruits.