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Can you identify the invaders?
Dame’s rocket (invasive) Fireweed (native)
Foxglove (exotic)
Purple loosestrife (invasive)
How about this suspect list?
Canadian fly honeysuckle
(native)
Multiflora rose (invasive)
Autumn olive (invasive)
Michigan Holly (native)
Who’s the invader?
Purplestem Angelica (Angelica
atropurpurea)
Poison Hemlock (Conium
maculatum)
Hairy Angelica (Angelica venenosa)
Suspect #1 Suspect #3
Why should we care?
• Economic impacts $$$• Impacts on native
species and biodiversity• Habitat alteration
Dichotomous Keys Made Easy
A dichotomous key is a reference tool used mainly in biology. It allows the user to determine what an organism is by answering numerous questions that have only two possible answers.
1 Object is a shade of green…go to 2
1’ Object is a shade of blue…go to 4
Decide how to separate what you are identifying into two groups by picking one character
Then choose one group and repeat…further dividing this group into two smaller subgroups
2 Object has 3 sides…triangle
2’ Object has 4 side…go to 3
Then choose another subgroup and further divide this into an even smaller subgroup
3 Object sides are all equal length…square
3’ Object has sides of two different lengths…rectangle
Repeat this pattern until all objects are identified
4 Object has rounded edges…circle
4’ Object has points…go to 5
5 Object has 5 sides…pentagon
5’ Object has 10 sides…star
Make your own key!
Examine your plant samples- Decide how to break them up into groups to
identify them
Example of first grouping:1 Plant is woody…go to 21’ Plant is herbaceous…go to 3