Donaldson: Peer Dichotomous Key
Biol 195 Summer 19
- Plants with flowers:
- Single flower on each stem: #3
B’. Multiple flowers on each stem:
- Flowers with petals: #2
C’. Flowers without petals: #4
- A. Plants lacking flowers: #1
- Leaves are needles: #1
Where does the pine cone fit in this? How is it accounted for using this? Asking for a friend 😉
Craig,
a little scrambled, but the general idea is there.
You have to think about two-way choices, go one way, the rest of the plants have to fit into the other choice. So 1. Plants with flowers, 1′ would be plants lacking flowers -> Plant 1 (that includes all images in that bin, needles, spruce cones, etc.), plants with flowers can be further divided into those with A. Single flower on a stem -> plant 3, and A’ Multiple flowers on a stem. Under the multiple flowers on a stem you can make a two-way choice again. B. Plants with petals -> plant 2 and B’ plants lacking petals -> plant 4.
All the images in one plate are considered a single plant, so there are only 4 plants and thus they only need to come out once in the key.
Best, Steffi.