966 watercolours of plants collected in 5 volumes (see also MSS.
Sherard 241, 243-245). These drawings served as the basis for the
illustrations included in the published Flora Graeca.
Further information about the Sibthorpian Herbarium and materials
relating to the Flora Graeca can be found at the Oxford Department
of Plant Sciences Herbaria website:
http://herbaria.plants.ox.ac.uk/bol/sibthorpherbarium.