Liz’s Dichotomous Key

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2 responses to “Liz’s Dichotomous Key”

1. 

   July 10, 2023

   Amanda Kemp

   Liz, I struggled too, but your dichotomous key is much more thorough and successful than mine! I thought it was helpful that you distinguished between flowers that do and do not alternate along the stem. That said, it will not be as useful when identifying plants that do not have flowers. My only recommendation is having a portion of the key used to identify spruce or other evergreens.

   Amanda

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2. 

   July 12, 2023

   Patricia Brown

   The challenge is to keep the key to just two choices per “tier.” That is what dichotomous means. I have introduced this to fourth graders by using shoes, one from each student thrown into a pile and we sit around in a circle. At each level there are only two choices. They might start with “shoes that have laces” and “shoes that don’t.” The second group would have boots, sandals, velcro straps, and anything else that isn’t secured with laces. Then within the group with laces, they might see one color more represented so they say, “black shoes and not black.” If they divided all by color there would be many more choices than two. So actually dichotomous keys simplify the path to identification, but without some basic experience with keys, I understand the frustration.

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