This is a graphite botanical illustration. It was an exercise found on draw space.com.
I signed up for an online course called, "Beginning a Nature Journal," taught by Jan Blencowe. This spread is for the first assignment to gather some things to draw from the garden or outside and do contour line drawings of them, add some text and create a frame around the drawing. I added some watercolor and a bit of stippling to add some detail, but both of those were outside the scope of the assignment.
Here is a botanical illustration in watercolor that I did of Luktviol, viola odorata. It is from an exercise I did in a Botanical Art Sketchbook workshop.