Ladislav Josef Čelakovský (November 29, 1834 – November 24, 1902) was a Czech botanist born in Prague. He was the son of writer František Ladislav Čelakovský, and father to mycologist Ladislav František Čelakovský (1864-1916). He took an evolutionary approach to the study of plants, alternation of generation, flower structure and other aspects. Source: Wikipedia (en)