Carolus Adrianus Johannes "Karel" Kreutz is a Dutch orchidologist, botanical writer and taxonomist, currently affiliated with the Centre for Biodiversity Naturalis in Leiden, Netherlands. He is regarded as an exceptionally experienced orchidologist, and has published orchid floras of Cyprus, Turkey, Rhodes, Crimea, Netherlands, Belgium and Germany, and is currently preparing a major overview in ten volumes of all orchid taxa in Europe, North Africa and the Middle East, employing modern taxonomy, nomenclature and research techniques.
Carolus Luython (French: Charles Luython; 1557 – 1620) was a Belgian composer. He was a late Renaissance composer of the "fifth generation" of the Franco-Flemish school.
Carolus Linnaeus (1707-1778) was a Swedish botanist and the father of taxonomy. He gave his (feminized) last name to his favorite flower, Linnaea Borealis (also known as Twinflower). Linnaea is also listed as a name on this website.