"By a botanist I mean one who understands how to observe the genera of Nature. I judge unworthy of the name of botanist the meddlesome person who is indifferent to genera."

"The calyx is the marriage bed, the corolla the bed-curtains, the filaments the spermatic vessels, the anthers the testes, the pollen the semen, the pistil the vagina, the ovary the uterus, the ovules …"

"The only way to know nature is to love it."

"Without names, knowledge is lost."

"The names of plants are the foundation of botany."