EditorialThunder leaf (Sempervivum tectorum) and royal candle (Verbascum thapsus), Thunder leaf and royal candle. FIGs. 33 and 34 on a sheet hand numbered 18. In: Anselmi Boetii de Boot I.C. Brugensis, anonymous, 1604 - 1632 and/or 1640, paper, ink, watercolor ...