My Dichotomous Key

A:  Does it have needles.

 Yes, plant 1 

No, B

B: Does it have flowers.

 Yes, C

No, plant 4

C: does it have purple flowers 

 Yes, plant 3

 No, plant 2

2 Comments

  1. Thanks Louise,
    similar to Justin’s key your key is very straightforward and uses few characters. Botanists tend to avoid using “no” and “yes” as a description of a couplet. So you could have used:
    A. Plant with needles …………. plant 1
    A’. Plant with leaves…………….. B.
    B. Plant with flowers ………. C.
    B’. Plant lacking flowers…… plant 4.
    C. Petals purple ……………plant 3.
    C’. Petals white……………..plant 2.

    Indenting each of the couplets makes it easier to navigate the key too (unfortunately it does not show up in my comment). Generally speaking dichotomous keys tend to use more than one character per couplet, but for this exercise one character is fine. Well done.

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