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

Status: Exotic.
Purple dead nettle (Lamium purpureum)
Native to: Europe and Asia.
Effects: Common on roadsides, this weed is commonly
found in farm fields that are not currently in use, as
well as in waste lands and near human developments.
Although it doesn’t seem to have strong, negative
ecological effects, planting or spreading this non-native
plant should still be avoided.
Distinctive features: This plant is usually only 4 or 5”
tall, and has square stems and crowded, overlapping,
heart-shaped leaves. It also forms tiny “snap-dragon”-
like purple flowers. The most distinctive characteristic
of Purple Dead Nettle is the purple tinge of the young
leaves at the apex of the stem. It is similar to henbit,
but its leaves have stalks, whereas henbit’s do not.
http://www.missouriplants.com/Pinkopp/Lamium_purpureum_pa
ge.html
Status: Invasive.
Purple loosestrife (Lythrum salicaria)
Native to: Eurasia.
Effects: This plant is a very strong competitor in
natural and disturbed wetlands. It outcompetes and
replaces native grasses, sedges, and other flowering
plants that provide a higher quality source of nutrition
for wildlife. A mature plant can produce 2 -3 million
seeds per year.
http://upload.wikimedia.org/wikipedia/commons/2/24/LythrumS
alicaria.jpg
Distinctive features: This plant can form large clumps
about five feet tall, with each clump forming numerous
showy spikes of reddish purple flowers. Each flower has
five to seven pink-purple petals surrounding a small
yellow center. Its leaves are long and narrow, and attach
closely to the four-sided stem opposite to one another
or in a “whorl”. Purple loosestrife may be distinguished
from similar looking species by its generally larger size,
opposite to whorled leaves, and densely packed flowers.