The Abstract is a brief summary of Important information from the
Introduction,
Materials & Methods,
Results  
Discussion

The Abstract should include the full scientific name of the plant(s) you are sytudying, plus its location.

The Reason for Study (Herr Webb ordered me to do it!!!!) may also be included. To clarify the taxanomic relationship of ..... and ..... chloroplast deoxyribonucleic ...........

Special Materials and Methods should be included.

This would include Novel or Noteworthy procedures like the use of a cryotome.
This will be somewhat difficult for you because you may not have published articles in this area. I will help you with this.

Your most important Results must be included.

Your results without too much interpretation should form the bulk of your Abstract.

Most significant aspects from Discussion can be stated.
(You may combine Results & Discussion)

It was concluded that the two taxa were the same species.

Example

The anatomy of Webbium maximus (Webb) leaves, stems and roots was determined. Plant specimens were obtained from the Lyon Arboretum, Oahu, Hawaii. Specimens were placed in an antifreeze fixative and sectioned with a freezing microtome. Sections were stained with Toluidine Blue and Phloroglucinol after the freezing support medium was eluted. Unstained specimens were also observed. Sections were viewed with bright-field and polarizing optics. The leaves had many xeromorphic adaptations. These included a cylindrical shape, thick cuticle, dense trichomes and stomatal crypts.  Several layers of palisade chlorenchyma and water-storage parenchyma constituted the mesophyll. Only one vascular bundle was present in the midrib and it was surrounded by a thick, sclerefied bundle sheath with a prominent bundle sheath extension. The petiole.......

If the Abstract gets too long you need to edit it like the following example.

The leaves had many xeromorphic adaptations, as did the petiole, stem and root.

Avoid Abbreviations in the Abstract!!!!!