I'd like to try and build a classification model for plants and flowers pictures, similar to what Daniel Nouri did with his app: http://danielnouri.org/notes/2014/09/13/identifying-birds,-butterflies,-and-wildflowers-with-a-snap/
For this I'd need an annotated set of plant and/or flowers (I don't have a definite goal) to start training with. I tried contacting the author, to no avail and I haven't been able to find anything interesting.
Kaggle released a dataset of leaves "shadows": https://www.kaggle.com/c/leaf-classification which can be interesting to work with, but makes the transition from raw picture to classification hard.
Any idea where I could find such a dataset?