The species and the genus are always the work of nature [i.e. specially created]; the variety mostly that of circumstance; the class and the order are the work of nature and art.
Carl LinnaeusThe plant kingdom covers the entire earth, offering our senses great pleasure and the delights of summer.
Carl LinnaeusWe admit as many genera as there are different groups of natural species of which the fructification has the same structure.
Carl LinnaeusNo one has been a greater botanist or zoologist. No one has written more books, more correctly, more methodically, from personal experience. No one has more completely changed a whole science and started a new epoch.
Carl Linnaeus