When you have all cross sections of root,stem, leaf,flower,...along with the morphological traits. That time, you need to start your writing explaining your findings. I found that simple, you probably think of literature, you can compare to any close plant to yours of the same family. Cheers.
If it is a new record look for good published morphological descriptions.
Select a few good descriptions. Now you go through your collections closely. Take the measurements, note the colours, etc. Particularly note any other characters not mentioned in the published literature. Now you sum up everything and come up with a good morphological description. Do not forget to cite those literature from where you have taken help for preparing the morphological description. In fact some descriptions are so good that it become difficult to change them. The measurements should strictly be based on your own collections. Do not include any character given in those descriptions but not in your own collections
Subir Bandyopadhyay Sir, I wanted to mean that if I don't find a good description from a well published literature to compare and write my own as you have said. I wanted to mean that by "Nearly Undescribed"