The Autumn Olive(emergent) is 20 feet in height. Leaves are dark green and untoothed. The underside is covered with silver-white scales. The flowers are light and yellow and are borne along twigs after the leaves have appeared early in the growing season. Due to the nitrogen-fixing capabilities it has the capacity to adversely affect the nitrogen cycle of native communities that may depend on infertile soils.
The Oxygen Weed has numerous threadlike roots, which are adventitious (branching from the stem) and, along with rhizomes (horizontal stems in the sediment), anchor it to the bottom. This plant grows supper fast and takes up most of the oxygen for fish and hurts the ecosystem.
Duckweed is a free floating plant that has individual fronds that produce fine roots. Mature fronds appear 1.5 to 2 times longer than wide, with widths measuring from 1-3 or five mm. Fronds are narrowly egg-shaped to slightly kidney-shaped and intensely green in color. As a problem it can become a serious nuisance due to its rapid colonization, easy distribution and quick dispersal rate.
These invasive plants are more troublesome than it's natural home because people aren't accustomed to them in different areas whereas where they used to be, people developed different ways to lessen or get rid of them.
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