Home How to Write a Scientific Name Practice Writing a Scientific Name What is a Key? Rules For Using a Key Sample Key Key Tutorial Horticultural Sites     Rules For Using a Key In order to successfully "key out" a plant, it is important to keep the following rules in mind. Read both contrasting statements (a couplet) completely. Even if the first choice sounds correct, the second may be more correct. If a term is unfamiliar, look up its definition--do not guess! Make measurements with a ruler--do not guess! Nature is highly variable, look at several samples before deciding. Never rely on just one sample. If in doubt about a choice, follow it both ways, then choose between the final plant names given.

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