I've been looking at a lot of sixteenth-century herbals (loosely defined) lately. To me, this is one of the most beautiful: Cristobal Acosta's Tractado de las Drogas, y medicinas de las Indias Orientales ... (1578). The images transform the typical leafy, full-bloom plants of contemporaneous herbals into cubist woodcuts, bizarrely static and yet vibrating with unexpected, emergent patterns.
I've grabbed a few of my favorites here from the Biblioteca Digital del Real Jardin Botanico. Enjoy.