Historia Plantarum (also called Conradi Gesneri Historia Plantarum) is an extensive botanical encyclopedia by the Swiss natural scientist, Conrad Gessner (1516 – 1565). Although compiled between 1555 and 1565, it was not published till 1754,[1] since he died of the plague, prior to its completion. To complete the work, he amassed a collection of some 1,500 drawings of plants, most of which were his own work. The scale and scientific rigour were unusual for the time, and Gessner was a skilled artist, producing detailed drawings of specific plant parts that illustrated their characteristics, with extensive marginal notation discussing their growth form and habitation.[2]