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If there are many scientific names for one plant, all but one are considered:

The first word in a scientific name is the genus or generic epithet.

The leaf of a clover or Oxalis usually has three leaflets.  It is then known as trifoliate.

The flower part of orchids that is modified to serve as a “landing platform” for pollinators is:

The delicious flesh of the avocado consists of mesocarp tissue.

One floral type of the following is actually an entire inflorescence – papilionaceous, campanulate, capitulum – which is it:

Which of the following lists of taxonomic categories are in the correct order from largest to smallest:

The transition from juvenile to adult morphology in plants doesn’t have to be sudden, but can be quite gradual and involve intermediate forms.

In the Bullhorn Acacias, a famous plant because it harbors nasty stinging ants that protect its foliage, the stipules are modified into:

The benefit of an indented key is that the user can see the entire thought process in the the questions and answers that lead to a resolution (identification),